S T 1 5 2 3 0 D C SEAGATE NO MORE PRODUCED Native| Translation ------+-----+-----+----- Form 3.5"/HH Cylinders 3892| | | Capacity form/unform 4294/ 5160 MB Heads 19| | | Seek time / track 10.0/ 1.7 ms Sector/track | | | Controller SCSI2 DI/WI/SCA/FAST Precompensation Cache/Buffer 512 KB ADAPTIVE Landing Zone Data transfer rate 6.000 MB/S int Bytes/Sector 512 20.000 MB/S ext SYNC Recording method RLL 1/7 operating | non-operating -------------+-------------- Supply voltage 5/12 V Temperature *C 5 55 | -40 70 Power: sleep W Humidity % 8 80 | 5 95 standby W Altitude km -0.305 3.048| -0.305 12.192 idle 9.0 W Shock g 10 | 60 seek W Rotation RPM 5411 read/write W Acoustic dBA spin-up W ECC Bit 96 MTBF h 800000 Warranty Month 60 Lift/Lock/Park YES Certificates CSA,FCC,IEC435,UL478,VDE ********************************************************************** L A Y O U T ********************************************************************** SEAGATE ST15230W/WD/WC/DC PRODUCT MANUAL 77767479 REV. A 3/1995 +---------------------------------------------------------++-+ | || | +++1 || | | |J6 || |J1 +++ || |SCSI | ST15230W/WD || |I/O | || | | || | | |+-1 | |+-+ | || |J1 | || |AUX | || | | |+-1 | |XX J1 | 8--------1 |XX Power | +--------+J2 |XX +---------------------------------------------------------+ 1 +---------------------------------------------------------+ | | +++1 | | |J6 |+-+ +++ || |SCSI | ST15230WC/DC || |I/O | || |J1 | || |80Pin | || | | || | | || | | || | | || | | |+-+ | | | 8--------1 | | +--------+J2 | +---------------------------------------------------------+ ********************************************************************** J U M P E R S ********************************************************************** SEAGATE ST15230W/WD/WC/DC PRODUCT MANUAL 77767479 REV. A 3/1995 Jumper Setting ============== REAR VIEW +------ 5V | +---- GND (TOP) +5V | | +-- GND 34 J1 1 | 1 | | | + 12V +-------------------------+-----+ +-------+ ----+||||||||||||||||||||| ::::::+-+O O O O+- +-------------------------++----+ +-------+ 68pin I/O Cable |||||| Power Connection Pin 12A+||||+----------- A0 GND--+||+------------ A1 |+------------- A2 +-------------- A3 +- +5V ---------------------+ Optional connections to * * * * o o o o o 1| switching circuits in host * * * o o o o o o| J6 equipment to etablished ---------------------+ drive ID. | | | | | Power | | | | +----------- A0 GND---+ | | +------------ A1 | +------------- A2 +-------------- A3 J1/J6 SCSI ID ------------- +----------+-------------------------------+ | SCSI ID | Jumper Location | | | PINS | | | 7-8 | 5-6 | 3-4 | 1-2 | +----------+-------+-------+-------+-------+ | 0 | OPEN | OPEN | OPEN | OPEN | +----------+-------+-------+-------+-------+ | 1 | OPEN | OPEN | OPEN | CLOSED| +----------+-------+-------+-------+-------+ | 2 | OPEN | OPEN | CLOSED| OPEN | +----------+-------+-------+-------+-------+ | 3 | OPEN | OPEN | CLOSED| CLOSED| +----------+-------+-------+-------+-------+ | 4 | OPEN | CLOSED| OPEN | OPEN | +----------+-------+-------+-------+-------+ | 5 | OPEN | CLOSED| OPEN | CLOSED| +----------+-------+-------+-------+-------+ | 6 | OPEN | CLOSED| CLOSED| OPEN | +----------+-------+-------+-------+-------+ | 7 | OPEN | CLOSED| CLOSED| CLOSED| +----------+-------+-------+-------+-------+ | 8 | CLOSED| OPEN | OPEN | OPEN | +----------+-------+-------+-------+-------+ | 9 | CLOSED| OPEN | OPEN | CLOSED| +----------+-------+-------+-------+-------+ | 10 | CLOSED| OPEN | CLOSED| OPEN | +----------+-------+-------+-------+-------+ | 11 | CLOSED| OPEN | CLOSED| CLOSED| +----------+-------+-------+-------+-------+ | 12 | CLOSED| CLOSED| OPEN | OPEN | +----------+-------+-------+-------+-------+ | 13 | CLOSED| CLOSED| OPEN | CLOSED| +----------+-------+-------+-------+-------+ | 14 | CLOSED| CLOSED| CLOSED| OPEN | +----------+-------+-------+-------+-------+ | 15 | CLOSED| CLOSED| CLOSED| CLOSED| +----------+-------+-------+-------+-------+ ------------+--------+-----PWA------------------ |87654321|J2 +--------+ Enable Terminator-+||||||+-TERMPWR Delay Motor Start--+||||+--TERMPWR Enable Motor Start--+||+---SS Write Protect ----++----Parity Option J2 Terminator Power-source Table W/WD ------------------------------------- ---1-+ ---1-+ ---1-+ o o | o X | X o | xxx | o X | X o | ----+ ----+ ----+ Term. Power Term. Power Term. Power from Bus to SCSI Bus from drive Pos. A -------------+----------------------------------------------------- J2 | Jumper | Installation |Jumper Function Description -------------+----------------------------------------------------- TE (8) |(Applies only to "W" models) ON |With the jumper installed, the On-board (non- |removable) terminator circuits are enabled |(connected to the I/O lines). Default is jumper |installed. +----------------------------------------------------- OFF |Terminator circuits not connected to I/O lines. -------------+----------------------------------------------------- DS ME (7/6) | OFF OFF |Spindle starts immediately after power up - Default |setting. +----------------------------------------------------- OFF ON |Drive spindle does not start until Start Unit command |received from host. On Off Spindle Startup is delayed |by SCSI ID times 12 seconds after power is applied, |i.e., drive 0 spindle starts immediately when DC |power connected, drive 1 starts after 12 second |delay, drive 2 starts after 24 second delay, etc. +----------------------------------------------------- ON ON |Drive spindle starts when Start Unit command received |from host. Delayed start feature is overridden and |does not apply when ME jumper is installed. -------------+----------------------------------------------------- WP (5) | ON |Entire drive is write protected. Off Drive is not |write protected. Default is no WP jumper installed. -------------+----------------------------------------------------- PE (4) | ON |Parity checking and parity error reporting by the |drive is enabled. Default is PE jumper installed. +----------------------------------------------------- OFF |Drive checks parity, but does not report result of |parity checking to host. -------------+----------------------------------------------------- SS (3) | OFF |Reserved jumper position. Default is no jumper |installed. -------------+----------------------------------------------------- TP TP(2/1)|(Not used on "WC/DC" models) OFF OFF |No terminator power is connected to drive terminators |or SCSI bus. +----------------------------------------------------- ON OFF |Drive supplies its own terminator power only. Jumper on |this position is factory default. +----------------------------------------------------- OFF ON |Drive supplies power to SCSI bus; pins 17, 18, 51 and |52 none to internal terminators. When drives have |differential I/O circuits, a jumper on the right TP |position may be needed to power external terminators |(see system documentation). The ST15230WD drive has |differential I/O circuits which have no terminator |circuits on the drive. |The "WC/DC" models have no provisions for |terminators on the drive and no provisions for |terminator power to be supplied to the 80 pin I/O |connector on the drive. +----------------------------------------------------- ON ON |Drive supplies terminator power to itself (internal |connection) and to SCSI bus pins 17, 18, 51 and 52. |This is a legal jumper setting. +----------------------------------------------------- TP Position A|(Applies to "W" models only) ON |This horizontally positioned jumper across the two |TP positions nearest PCB edge, connects terminator |power from SCSI bus I/O pin 26 to the drive's |internal terminators (for single-ended I/O only). +----------------------------------------------------- OFF |See above explanations for TP jumpers. -------------+----------------------------------------------------- -------------+----------------------------------------------------- J1-Auxiliary | Jumper | Jumper Function Description ("W" and "WD" models only) Installation | Drive ID on SCSI Bus (J1-auxiliary or J6 may be used, A3,A2,A1,A0 | as the ID circuits are wired in parallel). | The drive ID is binary coded positionwise i.e. jumper | in position A 3 is drive ID 8, A 2 is drive ID 4, | position A 1 is ID 2, position A 0 is ID 1 and no | jumpers is ID 0. Default is ID = 0. Both J1- auxiliary | and J6 should not be used at the same time, because at | some future time when the ID is changed the user could | fail to configure both J1-auxiliary and J6 the same. | "WC/DC" Models, do not have J1-auxiliary. -------------+------------------------------------------------------ -------------+------------------------------------------------------ J6 Jumper | Installation | Jumper Function Description ("W" and "WD" models only) A3,A2,A1,A0 | Drive ID on SCSI bus. Either J6 or J1-Auxiliary | (optional) may be used to select drive ID. Both | should not be used at the same time, because at some | future time when the ID is changed the user could fail | to configure both the same. Default is ID = 0. -------------+------------------------------------------------------ -------------+------------------------------------------------------ LED | Time shared (see Note [4]) J6 pin 8 used to connect a | cable for a remote drive activity LED indicator. Pin 8 | (bottom), the cathode connection, connects in the | drive to GRD through the emitter-collector junction | of a transistor switch that controls the LED on/off | condition. Pin 11, the anode connection, connects in | the drive to the +5 V supply through a pull-up | resistor. For "WC" and "DC" models LED signal in | J1 may be used instead. -------------+------------------------------------------------------ NOTE The PCB on "WC/DC" models does not have connector J1-Auxiliary. It has a single 80 pin combined SCSI I/O and DC power connector instead of the 68 pin SCSI I/O and 4 pin DC power connectors. Includes among the 80 pins are the SCSI ID, Motor Start and Delayed Motor Start select functions, and the remote drive activity LED signal. Do not use J6 for these functions if the host uses the ones included in the 80 pin J1 connector. NOTE Jumper header J6 can be used in one of five possible ways: - Do not use J6 at all, but instead use the same functions conveyed on lines in the 80 pin I/O J1 connector ("WC/DC" models), or for "W" and "WD" models, use J1-Auxiliary. - Use jumpers on J6 only to establish drive ID on the SCSI bus. Do not use both J6 and J1 or J1-Auxiliary signals to establish the drive ID. The drive activity LED signal in connector J1 or J1- Auxiliary may be used to convey that signal to/from the host. - Install a connector/cable on J6 for remote drive ID switching. Do not use both J6 and J1 signals to establish the drive ID. The drive activity LED signal in the 80 pin J1 I/O connector or J1-Auxiliary can be used in this situation. - Install a connector/cable on J6 for remote Drive Activity LED. Use the 80 pin I/O connector J1 for the drive ID signals ("WC/"DC" models) or J1-Auxiliary ("W" and "WD" models). - Install a connector/cable on J6 for all (remote ID switching and remote drive activity LED). Do not use both J6 and J1 or J1- Auxiliary to establish drive ID. ********************************************************************** I N S T A L L ********************************************************************** SEAGATE ST15230W/WD/WC/DC PRODUCT MANUAL 77767479 REV. A 3/1995 Notes On Installation ===================== Installation ------------ Drive default mode parameters are not normally needed for installa- tion. Ensure that the SCSI ID of the drive is not the same as the host adapter. Most host adapters use SCSI ID 7, which is the highest priority on both 8 and 16 bit data busses. If multiple devices are on the bus set the drive SCSI ID to one that is not presently used by other devices on the bus. If the drive is the only device on the bus, attach it to the end of the SCSI bus cable. Permanently installed terminators must be enabled on the drive for ST15230W models using a jumper plug. For ST15230WD/WC/DC models, terminators must be installed external to the drive. These external terminators must be provided by the user, systems integrator or host equipment manufacturer. If the drive is attached to a bus that contains other devices, and the new drive is not attached to the end of the bus, the terminator enable jumper should be removed from the new drive. Set all appropriate option jumpers for desired operation prior to power on. If jumpers are changed after power has been applied, recycle the drive power to make the new settings effective. Installation instructions are provided by host system documentation or with any additionally purchased drive installation software. The manufacturers installed labels must not be removed from the drive or covered with additional labels, as they contain information required when servicing the product. Caching write data ------------------ Write caching is a write operation by the drive that makes use of a drive buffer storage area where the data to be written to the medium is stored in one or more segments while the drive performs the write command. Write caching is enabled along with read caching. For write caching, the same buffer space and segmentation is used as set up for read functions. The buffer segmentation scheme is set up or changed independently, having nothing to do with whether or not read and write caching is enabled or disabled. When a write command is issued, the cache is first checked to see if any logical blocks that are to be written are already stored in the cache from a previous read or write command. If there are, the respective cache segments are cleared. The new data is cached for subsequent Read commands. If the number of write data logical blocks exceeds the size of the segment being written into when the end of the segment is reached, the data is written into the beginning of the same cache segment, overwriting the data that was written there at the beginning of the operation. However, the drive does not overwrite data that has not yet been written to the medium. Installation ------------ The drive is designed, manufactured, and tested with a "Plug in and Play" installation philosophy. This phi-losophy minimizes the requirements for highly trained personnel to integrate the drive into the OEM's system, whether in a factory or field environment. The drive has been low level formatted at the factory and should not be reformatted, unless the sector size or sparing allocation scheme is changed. Air cleanliness --------------- The drive is designed to operate in a typical office environment with minimal environmental control. Drive Orientation ----------------- The balanced rotary arm actuator design of the drive allows it to be mounted in any orientation. All drive performance characterization, however, has been done with the drive in horizontal (discs level) and vertical (drive on its side) orientations, and these are the two preferred mounting orientations. Cooling ------- Cabinet cooling must be designed by the customer so that the ambient temperature immediately surrounding the drive will not exceed temperatur. Specific consideration should be given to make sure adequate air circulation is present around the PCBs to meet the requirements. Cables should be routed such that they do not block cooling air flow. Drive Mounting -------------- When mounting the drive using the bottom holes care must be taken to ensure that the drive is not physically distorted due to a stiff non-flat mounting surface. The allowable mounting surface stiffness is 80 lb/in (14.0 N/mm). The following equation and paragraph define the allowable mounting surface stiffness: k * x = 80 lb (14.0 N) where 'k' represents the mounting surface stiffness (units of lb/in or N/mm), and, 'x' represents the out-of plane mounting surface distortion (units of inches or millimetres). The out-of plane distortion ('x') is deter-mined by defining a plane with three of the four mounting points fixed and evaluating the out-of-plane deflection of the fourth mounting point when a known force is applied to the fourth point. Media description ----------------- The media used on the drive has a diameter of approximately 95 mm (approximately 3.7 inches). The alumi-num substrate is coated with a thin film magnetic material, overcoated with a proprietary protective layer for improved durability and environmental protec- tion. Grounding --------- Signal ground (PCB) and HDA ground are connected together in the ST15230 drive and cannot be separated by the user. The equipment in which the drive is mounted is connected directly to the HDA and PCB with no electrically isolating shock mounts. If it is desired for the system chassis to not be connected to the HDA/PCB ground, the systems integrator or user must provide a nonconductive (electrically isolating) method of mounting the drive in the host equipment. DC cable and connector ---------------------- The "W" and "WD" model drives receive DC power through a 4 pin connector mounted at the rear of the main PCB. Recommended part numbers of the mating connector are listed below, but equivalent parts may be used. Mating connector parts ---------------------- Type of cable Connector Contacts (20-14 AWG) 14 AWG AMP 1-480424-0 AMP 60619-4 (Loose Piece) AMP 61117-4 (Strip) For "WC/DC" models, the DC power is routed through the SCSI 80 pin I/O connector. Current carrying capacity is for one drive only, plugged directly into the Host 80 pin I/O connector (no cable). Physical description -------------------- The "W" and "WD" model drives may be daisy-chained with other compatible SCSI devices using the same type cable. Both ends of the cable must be terminated. The model ST15230W and ST15230WC drives implement single ended drivers and receivers. The ST15230WD and ST15230DC model drives implement differential drivers and receivers. All signals are common between all SCSI devices. The drive may be daisy-chained only with SCSI devices having the same type drivers and receivers. Devices having single ended interface circuits cannot be on the same daisy-chain with devices having differential interface circuit. A maximum of 16 SCSI devices (including the Host) may be daisy-chained together. The SCSI Devices at both ends of the daisy-chain are to be terminated. Intermediate SCSI devices shall not be terminated. Remove the terminator enable jumper TE, not the terminator power source selector jumper TP. "WC/DC" model drives plug into PCB or bulkhead connectors in the Host. They may be connected in a daisy-chain by the host backplane wiring or PCB circuit runs that have adequate DC current carrying capacity to support the number of drives plugged into the PCB or bulkhead connectors. A single 80 pin I/O connector cannot support the DC current needs of several drives, no daisy-chain cables should be used. A single drive connected via a cable to a host 80 pin I/O connector is not recommended. Single ended I/O circuits ("W/WC" models) ----------------------------------------- The maximum total cable length for use with drives having single ended I/O driver and receiver circuits shall be 6 metres (19.7 ft.) when operating at line data transfer rates of 5 Mbytes/sec or less, and 3 metres (9.85 ft.) when operating at transfer rates greater than 5 Mbytes/sec (FAST SCSI). A stub length of no more than 0.1 metre (0.33 ft.) is allowed off the mainline interconnection with any connected equipment. An ideal impedance match with cable terminators implies a cable characteristic impedance of 132 ohms. Differential I/O circuits ("WD/DC" models) ------------------------------------------ The maximum total cable length for use with drives having differential I/O drivers and receiver circuits shall be 25 metres (82 ft.). A stub length of no more than 0.2 metre (0.66 ft.) is allowed off the mainline interconnection with any connected equipment. An ideal impedance match with cable terminators implies a cable characteristic impedance of 122 ohms). General cable characteristics ----------------------------- A characteristic impedance of 100 ohm 10% is recommended for unshielded flat or twisted pair ribbon cable. However, most available cables have a somewhat lower characteristic impedance. To minimize discontinuances and signal reflections, cables of different impedance's should not be used in the same bus. Implementations may require trade-offs in shielding effectiveness, cable length, the number of loads, transfer rates, and cost to achieve satisfactory system operation. If shielded and unshielded cables are mixed within the same SCSI bus, the effect of impedance mismatch must be carefully considered. Proper impedance matching is especially important in order to maintain adequate margin at FAST SCSI transfer rates. Cable for "W" and "WD" model drives ----------------------------------- Only nonshielded cable connectors are applicable. A 68 conductor flat cable or 34 twisted pair cable shall be used. A minimum conductor size of 28 AWG should be used to minimize noise effects. Suggested nonshielded flat cable part numbers are: Flat cable - 35M-3365-68 Twisted pair - Spectra Twist in flat 455-248-68 Equivalent parts may be used. Cables for "WC/DC" drive models ------------------------------- The 80 pin connector option is intended for use on drives that plug directly into a PCB or wall/bracket mounted connector in the host equipment. Cable mounted connectors would not be used in such a case. Installations with cable mounted connectors are not recommended. Mating connector for "WC/DC" models: ------------------------------------ The nonshielded mating connector shall be an 80 pin connector consisting of two rows of 40 male pins with adjacent pins 50 mils (1.27 mm) apart. The connector is keyed by virtue of its shape. Mating connectors for "W" and "WD" drive models ----------------------------------------------- The nonshielded cable connector shall be a 68 conductor connector consisting of two rows of 34 female contacts with adjacent contacts 50 mils (1.27 mm) apart. Recommended Mating Flat Cable Connector Part Numbers are: -----------+-------------------+------------------------------------- Closed end |Amp Model 749925-5 | (50 mil conductor centers for 28 or (For cable | | 30 AWG wire). This connector can ends) | | only be used on cable ends. Use | | two, 34 conductor, 50 mil center | | flat cable with this connector. -----------+-------------------+------------------------------------- Open end |Amp limite | |88-5870-294-5 | W/O Strain Relief, (25 mil conductor | | centers, 30 AWG wire). Use either on | | cable ends or in cable middle | | section for daisy-chain | | installations. The disc drive device connector is a nonshielded 68 conductor connector consisting of two rows of 34 female pins with adjacent pins 1.27 mm (0.050 inches) apart. The connector is keyed by means of its shape. Mating connectors for "WC/DC" models ------------------------------------ The nonshielded connector shall be an 80 conductor connector consisting of two rows of 40 contacts with adjacent contacts 50 mils (1.27 mm) apart. The connector is keyed by its shape. Recommended PCB or bulkhead mounted connectors are: Straight-in connector (most commonly used): Seagate P/N: 77678703 Amp US P/N: 2-557103-1 Amp Japan P/N: 5-175475-9 Right angle to PCB connector: Seagate P/N: 77678559 Amp US P/N: 2-557101-1 Amp Japan P/N: 5-175474-9 J2 Jumper plug part number --------------------------- Option select header connector J2 on the PCB uses an unusual type of jumper plug, so its part number is given here for reference: Molex 52747-0211 (Seagate P/N 77670952). A bag with the two jumper types used on the drive is included with every standard OEM drive. Electrical description ---------------------- Model ST15230W uses single ended interface signals. These signals must be terminated with 110 ohm active termination circuits at each end of the total cable. The terminators are enabled (or disabled) by installing (or removing) jumper plug TE. Single Ended circuits use open collector or three state drivers. The model ST15230WC uses single ended interface signals, but there are no provisions for terminators on the drive. Models ST15230WD and ST15230DC use differential interface signals and each of these must be termi-nated at each end of the total cable with 330 ohms to +5 V and 330 ohms to ground with 150 ohms between each differential pair. All I/O circuits are open collector, three state drivers. Differential I/O drives are shipped without terminators. These drives have no provisions for adding terminators on the PCB. On these drives some method of external termination must be provided by the user Systems Integrator or host equipment manufacturer. Transmitter characteristics --------------------------- Single ended drives use an ANSI SCSI compatible open collector single ended driver. This driver is capable of sinking a current of 48 mA with a low level output voltage of 0.4 volt. Receiver characteristics ------------------------ Single ended drives use an ANSI SCSI single ended receiver with hysteresis gate or equivalent as a line receiver. Differential drivers/receivers ------------------------------ The drive has no provisions for terminator circuits on differential I/O drives. Differential signals -------------------- All differential interface signals consist of two lines denoted +SIGNAL and -SIGNAL. A signal is true when +SIGNAL is more positive than -SIGNAL, and a signal is false when -SIGNAL is more positive than +SIGNAL. All assigned signals shall be terminated at each end of the cable. Drive user, Systems integrator or Host equipment manufacturer must provide some external means of termination. Output characteristics ---------------------- Each signal driven by differential interface drives shall have the following output characteristics when measured at the disc drive SCSI connector: Low-level output voltage = 2.0 V maximum at Low-level output current = 55 milliamps. High-level output voltage = 3.0 V minimum at High-level output current = -55 milliamps Differential voltage = 1.0 V minimum with commonmode voltage ranges from -7 V dc to +12 V dc. The output characteristics shall additionally conform to EIA RS-485- 1983. Input characteristics --------------------- Each signal received by differential interface drives shall have the following input characteristics when measured at the disc drive SCSI connector: Input current on either input = +2.0 milliamps maximum (includes both receivers and passive drivers). This requirement shall be met with the input voltage varying between -7 V dc and +12 V dc, with power on or off, and with the hysteresis equaling 35 mv, minimum. The input characteristics shall additionally conform to EIA RS-485- 1983. Terminator requirements ----------------------- Internal disc drive I/O termination (provided only in single ended I/O model ST15230W drives) consists of active circuits in an LSI module that is permanently mounted on the PCB. All single initiator/ single target (nondaisychain) applications require that the Initiator and disc drive be terminated. Daisy-chain applications require that only the units at each end of the daisy-chain be terminated. All other peripherals on the chain must not be terminated. Note. Remove drive terminator enabling jumper TE where terminators are not required. Removal of terminator power source selection jumper TP does not disconnect the terminator resistors from the circuit. It is highly recommended that ANSI SCSI-2 Standard's Alternative 2 termination (active termination) be used for single-ended ST15230W and ST15230WC applications, especially if the bus will be operated at transfer rates above 5 Mbytes/sec. The ST15230W provides on-board active termination that can be disabled by removal of the enable jumper TE. Note Active terminators are highly recommended for use in the daisy-chain as described above. Active and passive terminators should not be mixed on the same SCSI bus. Differential I/O ST15230WD does not have terminators on the PCB. The user, systems integrator or host equipment manufacturer must provide a terminator arrangement external to the drive. Models ST15230WC and ST15230DC do not have terminators on the drive PCB and there is no provision for terminator power in the 80 pin I/O connector. Terminator power ---------------- The "W/WD" model drives may be configured to accept terminator power from drive connector pins 17, 18, 51 and 52 of the SCSI Bus, to supply power to the SCSI bus or to provide terminator power for internal termination circuits from the drive power connector. The drive can provide power both to its own terminators and to the SCSI Bus terminators at the other end of the I/O cable if both "TP" jumpers are on (models ST15230W/WD only). SCSI devices providing terminator power (TERMPWR) shall have the following characteristics: V TERM = 4.50 V to 5.25 V 800 mA min source drive capability 1.0 A maximum The "WC" and "DC" model drives cannot furnish terminator power, because no conductors in the 80 pin I/O cable are devoted to terminator power. ********************************************************************** F E A T U R E S ********************************************************************** SEAGATE ST15230W/WD/WC/DC PRODUCT MANUAL 77767479 REV. A 3/1995 Scope ----- This Manual describes the Seagate Technology, Inc. Hawk 4 Family Disc Drive. This high capacity, high performance member of the Seagate 3.5 inch rigid disc family is a companion product to the ST12400 drive family. It has an embedded SCSI controller. Performance information is given in Section 5. The Hawk 4 Family interface is defined for functional compatibility to a subset of the Seagate SCSI Interface Specification 77738479, and the ANSI SCSI-2 and SCSI-3 standards. The Model Hawk 4 Family drives are classified as "Intelligent" peripherals. The Hawk 4 Family provides Level 2 conformance (highest level) with the ANSI SCSI-1 standard. Details of the Hawk 4 Family drive SCSI implementation are provided in Section 11 of this manual, (Vol. 1) and in the SCSI Interface Product Manual P/N 77738479 (Vol. 2; Ver. 2). The Hawk 4 family of drives consists of the ST15230W/WD/WC/DC drives. From this point on in this Product Manual the reference to Hawk 4 Family is referred to as "the drive" (unless reference to individual models are necessary). The drive printed circuit board is referred to as a PCB. Applicable standards and reference documentation ------------------------------------------------ The drive has been developed as a system peripheral to the highest standards of design and construction. The drive depends upon its host equipment to provide adequate power and environment in order to achieve optimum performance and compliance with applicable industry and governmental regulations. Special atten-tion must be given in the areas of safety, power distribution, shielding, audible noise control, and temperature regulation. In particular, the drive must be securely mounted in order to guarantee the specified performance characteristics. Standards --------- The Hawk 4 Family (Wide) complies with Seagate standards as noted in the appropriate sections of this manual and the Seagate SCSI Interface Specification, P/N 77738479 (Vol. 2, Version 2). The Hawk 4 Family is a UL Recognized component per UL 1950 and a CSA Certified component per CAN/ CSA-C22.2 No. 950-M89. It also meets the requirements of DIN VDE 0805:1993 and EN60950: 1992 (IEC 950). The drive, as delivered, is designed for system integration and installation into a suitable enclosure prior to use. As such the drive is supplied as a subassembly and is not subject to Subpart J of Part 15 of the FCC Rules and Regulations nor the Radio Interference Regulations of the Canadian Department of Communications. However, the unit has been tested using proper shielding and grounding and found to be compliant with Class A limits of the FCC Rules and the Regulations of The Canadian Department of Communications. The physical design characteristics of the drive serve to minimize radiation when installed in an enclosure that provides reasonable shielding. As such, the drive is capable of meeting the Class B limits of the FCC Rules and Regulations of the Canadian Department of Communication. However, it is the users responsibility to assure that the drive meets the appropriate EMI requirements in their system. Shielded I/O cables may be required if the enclosure does not provide adequate shielding. If the I/O cables are external to the enclosure, shielded cables should be used, with the shields grounded to the enclosure and to the host controller. CAUTION! To avoid potential service problems, observe the following precau- tions: The Manufacturers installed labels must not be removed from the drive or covered with additional labels, as they contain information required when servicing the product. Applicable reference documents ------------------------------ Installation Guide Seagate P/N 77767477 Product Manual - SCSI Interface Seagate P/N 77738479 ANSI Small Computer System Interface (SCSI): Document Number ANSI3.131-1986 (X3T9/84.40 Rev. 1B) (X3T9.2/82-2 Rev. 17B), X3T9.2/86-109 Revision 10H (SCSI-2) and X3T9.2-184 Rev. 4 (SCSI-3). Seagate Package Test Requirements P/N 30190-001 (packages under 100 lbs) Seagate Package Test Requirements P/N 30191-001 (packages over 100 lbs). In case of conflict between this document and any referenced document, this document shall take precedence. General description ------------------- The drives are a member of a family of low cost, high performance, highly reliable, random access storage devices designed to meet the needs of the OEM marketplace. The drive records and recovers data on 3.7 inch (95 mm) fixed discs. The drive supports the Small Computer System Interface-2 (SCSI) as described in the ANSI SCSI-1, SCSI-2 and SCSI-3 Interface Specifi- cations to the extent described in this product manual (Vol. 1), which defines the product performance characteristics of the Hawk 4 Family of drives, and the SCSI Interface Product Manual P/N 77738479 (Vol. 2, Version 2) which describes the general interface characteristics of this and other families of Seagate 3.5-inch drives. The drive interface supports multiple initiators, disconnect/reconnect, self configuring host software and automatic features that relieve the host from the necessity of knowing the physical characteristics of the targets (logical block addressing is used). The Head/Disc Assembly (HDA) is environmentally sealed at the factory. Air recirculates within the HDA through a nonreplaceable filter to maintain a contamination free head/disc environment. NEVER disassemble the Head/Disc Assembly (HDA). This exploded view is for information only. Do not attempt to service items in the sealed environmental enclosure (heads, media, actuator, etc.) as this requires special facilities. The drive contains no parts replaceable by the user. The drive warranty is voided if the HDA is opened. The Hawk 4 Family (Wide) drives use a dedicated landing zone at the innermost radius of the media to eliminate the possibility of destroying or degrading data by landing in the data zone. The drive automatically goes to the landing zone when the power is removed. The Hawk 4 Family (Wide) drives incorporate an automatic shipping lock which prevents potential damage to the heads and discs that result from movement during shipping and handling. The shipping lock disengages when power is applied to the drive and the head load process begins. The Hawk 4 Family (Wide) drives decode Track 0 location from the dedicated servo surface to eliminate mechanical transducer adjustments and related reliability concerns. The Hawk 4 Family (Wide) drives use a high performance actuator assembly that consists of a low inertia, balanced, patented, straight arm design that provides excellent performance with minimum power dissipation. Standard features ----------------- - The Hawk 4 Family (Wide) has the following standard features: - Integrated SCSI Controller - Single Ended and Differential SCSI drivers and receivers - Asynchronous and Synchronous data transfer protocol - Firmware downloadable via SCSI interface - Selectable sector size from 256 to 4096 bytes/sector - Programmable sector reallocation scheme - Flawed sector reallocation at format time - Programmable auto write and read reallocation - Reallocation of defects on command (Post Format) - 96 bit Reed-Solomon error correcting code - Sealed Head/Disc Assembly - No preventative maintenance or adjustment required - Dedicated head landing zone - Automatic shipping lock - Automatic Adaptive Thermal Compensation - Patented Tri-Phase Servo with embedded Grey Code track address to - guarantee servo positioning. - Self diagnostics performed at power on - 1:1 Interleave - Zoned Bit Recording (ZBR) - Vertical, horizontal, or top down mounting - Dynamic spindle brake - 512 K byte data buffer - Permanently mounted terminators (for model ST15230W only), enabled by installation of a jumper plug. Performance ----------- - Programmable multi-segmentable cache buffer - 5411 r/min Spindle. - Average latency = 5.54 ms - Command Queuing of up to 64 commands per initiator - Background processing of queue - Supports start and stop commands - Low audible noise for office environment - Low power consumption Reliability ----------- - 800,000 hour MTBF - Adaptive seek velocity. - Improved seek performance - LSI circuitry - Balanced low mass rotary voice coil actuator - 5 year warranty Formatting ---------- It is not necessary to low level format this drive. The drive is shipped from the factory low level formatted in 512 byte sectors. Reformat the drive if one of the following occurs. - A different sector size is selected. - A different spare sector allocation scheme is selected. High level format the drive. This involves assigning one or more partitions or logical drives to the drive volume. Follow the instructions in the system manuals for the system into which the drive is to be installed. Start/stop time --------------- After DC power has been applied, the drive becomes ready within 25 seconds if the Motor Start Option is disabled (i.e. the motor starts as soon as the power has been applied). During this time the drive responds to some commands over the SCSI interface* in less than 3 seconds. Stop time is less than 20 seconds from removal of DC power. If the Motor Start Option is enabled the internal controller accepts the commands listed in the SCSI Interface Product Manual less than 3 seconds after DC power has been applied. After the Motor Start Command has been received the drive becomes ready for normal operations within 25 seconds. The Motor Start Command can also be used to command the drive to stop the spindle. There is no power control switch on the drive. Prefetch/multi-segmented cache control -------------------------------------- The drive provides prefetch (read look-ahead) and multi-segmented cache control algorithms that in many cases can enhance system performance. "Cache" as used herein refers to the drive buffer storage space when it is used in "cache" operations. To select prefetch and cache features the host sends the Mode Select command with the proper values in the applicable bytes in Mode Page 08h. Prefetch and cache operation are independent features from the standpoint that each is enabled and disabled independently via the Mode Select command. However, in actual operation the prefetch feature overlaps cache operation. Cache operation --------------- In general, 448 Kbytes of the 512 Kbytes of physical buffer space in the drive can be used as storage space for cache operations. The buffer can be divided into logical segments (Mode Select Page 08h, byte 13) from which data is read and to which data is written. The drive maintains a table of logical block disk medium addresses of the data stored in each segment of the buffer. If cache operation is enabled (RCD bit = 0 in Mode Page 08h, byte 2, bit 0. See SCSI Interface Product Manual), data requested by the host with a Read command is retrieved from the buffer (if it is there), before any disc access is initiated. If cache operation is not enabled, the buffer (still segmented with required number of segments) is still used, but only as circular buffer segments during disc medium read operations (disregarding Prefetch operation for the moment). That is, the drive does not check in the buffer segments for the requested read data, but goes directly to the medium to retrieve it. The retrieved data merely passes through some buffer segment on the way to the host. For a cache miss, all data transfers to the host are in accordance with "buffer-full" ratio rules. On a cache hit the drive ignores the buffer full ratio. See explanations associated with Mode page 02h (disconnect/reconnect control) in the SCSI Interface Product Manual. The following is a simplified description of a read operation with cache operation enabled: Case A - A Read command is received and the first logical block (LB) is already in cache: 1. Drive transfers to the initiator the first LB requested plus all subsequent contiguous LB's that are already in the cache. This data may be in multiple segments. 2. When the requested LB is reached that is not in any cache segment, the drive fetches it and any remaining requested LB's from the disc and puts them in a segment of the cache. The drive transfers the remaining requested LB's from the cache to the host in accordance with the disconnect/reconnect specification mentioned above. 3. If the prefetch feature is enabled, refer to section 5.5.2 for operation from this point. Case B - A Read command requests data, the first LB of which is not in any segment of the cache: 1. The drive fetches the requested LB's from the disc and transfers them into a segment, and from there to the host in accordance with the disconnect/reconnect specification referred to in case A. 2. If the prefetch feature is enabled, refer to section 5.5.2 for operation from this point. Each buffer segment is actually a self- contained circular storage (wraparound occurs), the length of which is an integer number of disc medium sectors. The wraparounds capability of the individual segments greatly enhances the buffer's overall performance as a cache storage, allowing a wide range of user selectable configurations, which includes their use in the prefetch operation (if enabled), even when cache operation is disabled. The number of segments may be selected using the Mode Select command, but the size can not be directly selected. Size is selected only as a by-product of selecting the segment number specification. The size in Kbytes of each segment is reported by the Mode Sense command page 08h, bytes 14 and 15. If a size specification is sent by the host in a Mode Select command (bytes 14 and 15) no new segment size is set up by the drive, and if the "STRICT" bit in Mode page 00h (byte 2, bit 1) is set to one, the drive responds as it does for any attempt to change unchangeable parameters (see SCSI I/O Product Manual). The ST15230 family of drives supports operation of any integer number of segments from 1 to 16. Prefetch operation ------------------ If the Prefetch feature is enabled, data in contiguous logical blocks on the disc immediately beyond that which was requested by a Read command can be retrieved and stored in the buffer for immediate transfer from the buffer to the host on subsequent Read commands that request those logical blocks (this is true even if "cache" operation is disabled). Though the prefetch operation uses the buffer as a "cache", finding the requested data in the buffer is a prefetch "hit", not a "cache" operation "hit". Prefetch is enabled using Mode Select page 08h, byte 12, bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0 enables prefetch. Since data that is prefetched replaces data already in some buffer segment(s), the host can limit the amount of prefetch data to optimize system performance. The max prefetch field (bytes 8 and 9) limits the amount of prefetch. The drive does not use the prefetch "ceiling field" (bytes 10 and 11). During a prefetch operation, the drive crosses a cylinder boundary to fetch more data only if the Discontinuity (DISC) bit is set to one in bit 4 of byte 2 of Mode parameters page 08h. Whenever prefetch (read look-ahead) is enabled (enabled by DRA = 0), it operates under the control of ARLA (Adaptive Read Look-Ahead). If the host uses software interleave, ARLA enables prefetch of contiguous blocks from the disk when it senses that a prefetch "hit" will likely occur, even if two consecutive read operations were not for physically contiguous blocks of data (e.g. "software interleave"). ARLA disables prefetch when it decides that a prefetch "hit" will not likely occur. If the host is not using software interleave, and if two sequential read operations are not for contiguous blocks of data, ARLA disables prefetch, but as long as sequential read operations request contiguous blocks of data, ARLA keeps prefetch enabled. Write errors ------------ Write errors can occur as a result of media defects, environmental interference, or equipment malfunction. Therefore, write errors are not predictable as a function of the number of bits passed. If an unrecoverable write error occurs because of an equipment malfunction in the drive, the error is classi-fied as a failure affecting MTBF. Unrecoverable write errors are those which cannot be corrected within two attempts at writing the record with a read verify after each attempt (excluding media defects). Seek errors ----------- A seek error is defined as a failure of the drive to position the heads to the addressed track. There shall be no more than one recoverable seek error in 10 7 physical seek operations. After detecting an initial seek error, the drive automatically reseeks to the addressed track up to 3 times. If a reseek is successful, the Extended Sense reports a seek positioning error (15h), no seek complete error (02h), or track follow error (09h), and the sense key reports a recovered error (1h). If all three reseeks fail, a seek positioning error (15h) is reported with a Medium (3h) or Hardware error (4h) reported in the Sense Key. This is an unrecoverable seek error. Unrecoverable seek errors are classified as failures for MTBF calculations. Ref. section 5.1.1.2 of SCSI-2 Interface Product Manual P/N 77738479 for Request Sense command information. Preventive maintenance ---------------------- No routine scheduled preventive maintenance shall be required. Service life ------------ The drive shall have a useful service life of five years. Depot repair or replacement of major parts is permitted during the lifetime. Service philosophy ------------------ Special equipment is required to repair the drive HDA. In order to achieve the above service life, repairs must be performed only at a properly equipped and staffed service and repair facility. Troubleshooting and repair of PCBs in the field is not recommended, because of the extensive diagnostic equipment required for effective servicing. Also, there are no spare parts available for this drive. Drive warranty is voided if the HDA is opened. Defect and error management --------------------------- The drive, as delivered, complies with this specification. The read error rate and specified storage capacity are not dependent upon use of defect management routines by the host (initiator). Defect and error management in the SCSI system involves the drive internal defect/error management and SCSI systems error considerations (errors in communications between Initiator and the drive). Tools for use in designing a defect/error management plan are briefly outlined in this section, with references to other sections where further details are given. Options ------- All options are incorporated or packaged at the manufacturing facility. Front panel ----------- The normal front panel available is black plastic. Other panel colors may be special ordered. Each panel has a single rectangular green LED indicator lens which, when glowing, indicates the drive is selected. Single unit shipping pack ------------------------- The drive is normally shipped in bulk packaging to provide maximum protection against transit damage. Units shipped individually require additional protection as provided by the single unit shipping pack. Users planning single unit distribution should specify this option. ********************************************************************** G E N E R A L ********************************************************************** SEAGATE SUPPORT SERVICES Seagate Technology ------------------ Technical Support Services If you need assistance installing your drive, consult your dealer. Dealers are familiar with their unique system configurations and can help you with system conflicts and other technical issues. If you need additional assistance with your Seagate(r) drive or other Seagate products, use one of the Seagate technical support services listed below. SeaFONE at 1-800-SEAGATE (1-800-732-4283) Seagate's 800 number allows toll-free access to automated self-help services, providing answers to commonly asked questions, troubleshooting tips and specifications for disc drives and tape drives. This service is available 24 hours daily and requires a touch-tone phone. If you need to speak to a technical support engineer, dial this number and listen to the options for technical support. (International callers can also reach this automated self-help service by dialing 408-456-4496). Seagate Technology online services Using a modem, you can obtain troubleshooting tips, free utility programs, drive specifications and jumper settings for Seagate's entire product line. You can also download software for installing and analyzing your drive. SeaNET You can obtain technical information on Seagate drives, Seagate software and much more over the Internet from Seagate's World Wide Web home page (http://www.seagate.com) or Seagate's ftp server (ftp://ftp.seagate.com). You may also send E-mail with your questions to DiscSupport@ Seagate.com or TapeSupport@Seagate.com. SeaBOARD SeaBOARD is a computer bulletin board system (BBS) that contains information about Seagate's disc and tape drive products and is available 24 hours daily. Set your communications software to eight data bits, no parity and one stop bit (8-N-1). SeaBOARD phone numbers are listed in the following table. BBS Location Modem number United States Disc: 408-434-1080; Tape: 408-456-4415 England 44-1628-478011 France 33 1-48 25 35 95 Germany 49-89-140-9331 Singapore 65-292-6973 Thailand 662-531-8111 Australia 61-2-9756-2359 Taiwan 886-2-719-6075 Seagate CompuServe forum Online technical support for Seagate products is available on CompuServe. To access our technical support forum, type go seagate. This forum provides information similar to that found on SeaBOARD. In addition, you can type questions or browse through previous questions and answers on the forum messages. Seagate Technology FAX services SeaFAX You can use a touch-tone telephone to access Seagate's automated FAX system to receive technical support information by return FAX. This service is available 24 hours daily. Location Telephone number United States 1-800-SEAGATE or 408-456-4496 England 44-1628-894084 Australia 61-2-9756-5170 Seagate technical support FAX You can FAX questions or comments to technical support specialists 24 hours daily. Responses are sent during business hours. Location FAX number United States 408-944-9120 England 44-1628-890660 France 33 1-46 04 42 50 Germany 49-89-1430-5100 Australia 61-2-9725-4052 Singapore 65-293-4722 Hong Kong 852-2368 7173 Taiwan 886-2-715-2923 Korea 82-2-556-7294/4251 Seagate technical support You can talk to a technical support specialist during business hours Monday through Friday for one-on-one technical help. Before calling, note your system configuration and drive model number (STxxxx). There are several technical support phone numbers available for various Seagate products. Location Telephone number United States Please dial 1-800-SEAGATE for the specific product telephone number. (6:00 A.M. to 11:15 A.M., 12:30 P.M. to 5:00 P.M., Pacific time, M-F) England 44-1628-894083 (10:00 A.M. to 1:00 P.M., 2:00 P.M. to 5:00 P.M., M-F) France 33 1-41 86 10 86 (9:30 A.M. to 12:30 P.M., 2:00 P.M. to 5:00 P.M., M-F) Germany Disc: 49-89-140-9332; (9:30 A.M. to 12:30 P.M., 2:00 P.M. to 4:00 P.M., M-F) Tape: 49-89-140-9333 Australia 61-2-9725-3366 (9:00 A.M. to 5:00 P.M., M-F) Singapore 65-290-3998 (9:00 A.M. to 12:00 P.M., 2:00 P.M. to 5:00 P.M., M-F) Hong Kong 852-2368 9918 Taiwan 886-2-514-2237 Korea 82-2-556-8241 SeaTDD 408-944-9121 Using a telecommunications device for the deaf (TDD), you can send questions or comments 24 hours daily and exchange messages with a technical support specialist between 6:00 A.M. to 11:15 A.M. and 12:30 P.M. to 5:00 P.M. (Pacific time) Monday through Friday. Customer Service Centers Seagate direct OEM, Distribution, System Integrator and Retail customers should contact your Seagate Service Representative for warranty information. Other customers contact your place of purchase. Seagate offers comprehensive customer support for all Seagate drives. Seagate customer service centers are the only facilities authorized to service Seagate drives. These services are available worldwide. Location Telephone number FAX number United States 1-800-468-3472; 405-949-6740 Other Americas (Canada & Brazil) 405-949-6706; 405-949-6738 Mexico 525-546-6965; 525-546-4888 Europe, Middle East & Africa 31-2065-43300; 31-2065-34320 Asia Pacific & Australia 65-485-3595; 65-485-4980 Japan 81-3-5462-2904; 81-3-3462-2979 Seagate, Seagate Technology and the Seagate logo are registered trademarks of Seagate Technology, Inc. SeaFAX, SeaFONE, SeaBOARD, SeaTDD, SeaNET, Medalist and DiscWizard are either trademarks or registered trademarks of Seagate Technology, Inc. or one of its subsidiaries. All other trademarks or registered trademarks are the property of their respective owners.