W R E N I I H H 9 4 2 0 4 - 8 1 CDC NO MORE PRODUCED Native| Translation ------+-----+-----+----- Form 5.25"/HH Cylinders 1032| 1024| 516| 745 Capacity form/unform 71/ 80 MB Heads 5| 8| 10| 11 Seek time / track 29.0/ 5.0 ms Sector/track 27| 17| 27| 17 Controller IDE / AT Precompensation Cache/Buffer 32 KB LOOK-AHEAD Landing Zone Data transfer rate 9.375 MB/S int Bytes/Sector 512 4.700 MB/S ext Recording method RLL operating | non-operating -------------+-------------- Supply voltage 5/12 V Temperature *C 10 50 | -40 70 Power: sleep W Humidity % 8 80 | 5 95 standby W Altitude km -0.305 3.048| -0.305 12.210 idle 18.0 W Shock g 2 | 32 seek 20.0 W Rotation RPM 3597 read/write W Acoustic dBA spin-up W ECC Bit 56 MTBF h 40000 Warranty Month Lift/Lock/Park YES Certificates CSA,SDA,FCC,IEC380,IEC435,... ********************************************************************** L A Y O U T ********************************************************************** SEAGATE ST274A/280A PRODUCT MANUAL 77765346-D +--------------------------------------------------------+ |+-+LED |XX Power |+-+ |XX | |+-+ | || | J2 | |+-1 | |+-+ | |+-+Master | |1-+Slave | |XX | |XX 40 pin | |XX I/O | |.X J3 | |XX | |XX | |XX | |XX1 +--------------------------------------------------------+ ********************************************************************** J U M P E R S ********************************************************************** SEAGATE ST274A/280A PRODUCT MANUAL 77765346-D Jumper setting ============== J2 for factory use. Master/Slave Present -------------------- 1 & 2 ON Drive is master OFF Drive is slave BA0/No Slave Present Jumper --------------------------- 3 & 4 ON For regular models, jumper, is present, must remain on. Drive will not operate correctly if jumper is removed. For "C" models, jumper ON indicates no slave present; jumper OFF means slave drive is present. The 94204 is capable of operating on the AT bus in a daisy chained configuration with a second drive/controller that operates in accordance with these specifications. One drive is designated as master and the other as the slave. Models 94204-65C, 94204-71C, 94204-74C and 94204-81C can be daisy chained in either configuration with other compatible drives that conform to the proposed ANSI ATBUS definition. Selection of the Master drive is made by a jumper plug installed on two pins on a connector header to the right of the 40 pin interface connector at the rear of the drive. No jumper plug present means the drive is the slave. When it is intended that a drive should be the slave, do not store the removed jumper plug on any other pins of the connector, as that will cause the drive to operate incorrectly. Slave Present Selection ----------------------- Slave Present Selection is made by removing the jumper from the pins adjacent to the Master/Slave select jumper. A jumper plug installed means that no slave drive is present. J3 DC Power and pin connector assignments ------------------------------------------- +------------+ pin 1 +12 VDC | 1 2 3 4 | pin 2 +12 Volts Return +------------+ pin 3 + 5 Volts Return pin 4 + 5 VDC ********************************************************************** I N S T A L L ********************************************************************** SEAGATE ST274A/280A DRIVE PRODUCT MANUAL 77765346-D Notes on installation ===================== Drive mounting -------------- horizontally vertically +-----------------+ +--+ +--+ +------------------+ | | | +-----+ +-----+ | | | x | | | | | | | | x+----------------+x +-+-----------------+-+ | | | | | | ||x x|| +---------------------+ | | | | | | || x x || | | | | | | || x x || x x | | | | | | || x x || +------x------x-------+ | +-----+ +-----+ | || xx || +-+------x--x-------+-+ +--+ +--+ || x x || | xx | || x x || | x x | || x x || +---x--------x----+ |x x| x x x++----------------++x UNACCEPTABLE! UNACCEPTABLE! Never install PC board on the Top! Drive Orientation ----------------- The permissible drive mounting orientation include operation in the horizontal plane and in the vertical plane. Mounting with either end down (front or rear) is not permissible. An angle of 15* up from the horizontal (front end only) is acceptable for the horizontal orienta- tion. WREN 2HH (AT interface) is designed, manufactured, and tested with a "Plug-in and Play" installation philosophy. Basically, this philosophy minimizes the requirements for highly trained personnel to integrate the WREN 2HH (At interface) into an OEM's system, wether in a factory or field environment. Cooling ------- Cabinet cooling must be designed by the customer so that the ambient temperature immediately surrounding the WREN 2HH (AT interface) will not exceed temperature conditions. Service Tools ------------- No special tools are required for site installation or recommended for site maintenance. The depot repair philosophy of WREN 2HH (AT interface) precludes the necessity for special tools. Should field repair of items external to the HDA be desired, one 6 point size T10 Torx driver is required. This hand tool may be ordererd through most commercial tool catalogs. Air Cleanliness --------------- The WREN 2HH (AT interface) is designed to operate in a typical office environment with minimal environment control. Physical Interface ------------------ The physical interface consists of single ended TTL compatible re- ceivers and drivers communicating through a 40 conducter flat ribbon nonshielded cable maximum length 24 inches (0.61 metre) using asynchronous interface protocol. Interface cabling options ------------------------- +-------------------------------------+ | HOST | | I/O | +---------+---------------------------+ | | +----------------+ +---------+--+ +----------+--+ | 'AT' | | 'AT' | | WREN | | WREN | +------------+ +-------------+ If you have a 94204-xxC, then you can connect two different model drives on the same host adapter. (i.e. a 94204-xxC and a 94354-xxx drive) If you do not have a "C" after the model number, then you can only connects two similar WREN 2 94204-xx model drives. DC Cable and Connector ---------------------- The WREN 2HH (AT interface) receives DC power through a 4 pin rigth angle connector mounted on the main circuit board. Recommended part numbers for the mating connector are included below, but equivalent parts may be used. Type of cable: 18 AWG Connector: AMP 1-480424-0 Contacts: AMP 60619-4 (Loose Piece); AMP 61117-4 (Strip) Device Grounding ---------------- The WREN 2HH (AT interface) is shipped with the DC Logic ground and the chassis ground joined together. These two ground planes may be separated by repositioning the motor control board ground washer. Note: If the grounds are to be separated, the washer must be oriented so that it does not contact the ground run near the screw at any point. System Ground Quick Connect Terminal ------------------------------------ System ground may be connected to the Quick connect terminal. Recommended part numbers for this connector and the mating ground cable connector are listed, but equivalent parts may be used. Drive Connector Terminal: AMP P/N 61664-1 Cable Connector Terminal: AMP P/N 62137-2 I/O Cable and Connector ----------------------- The I/O connector is a 40 pin connector. The odd pins are located along the edge of the printed circuit board with pin 1 leftmost. The even pins are on the side away from the edge of the printed circuit board. A key is provided by the removal of Pin 20. The corresponding pin on the cable connector should be plugged. Seagate recommends keying this connector to prevent the possibility of installing it upside down. Maximum I/O cable length is 24 inches (.61 metres). Recommended part numbers for the mating connector are included below, but equivalent parts may be used. Connector: 40 pin, 3M-3417-7000 (Strain relief 3448-2040) Cable: Flat Cable (Stranded AWG 28) 3M-3365-40 Flat Cable (Stranded AWG 28) 3M-3517-40 (Shielded Cable) ********************************************************************** F E A T U R E S ********************************************************************** SEAGATE ST274A/280A PRODUCT MANUAL 77765346-D General Description ------------------- The WREN 2HH (AT interface) drives are members of a family of low cost, high performance, highly reliable, random access storage devices designed to meet the needs of the OEM, AT (IDE) compatible, marketplace. Standards --------- The WREN 2HH (AT interface) has been developed as system peripherals to the highest standards of design and construction. The WREN depends upon their host equipment to provide adequate power and environment in order to achieve optimum performance and compliance with applicable industry and governmental regualations. Special attention must be given in the areas of safety, power distribution, shielding, audible noise control, and temperature regulation. The WREN 2HH (AT interface) is a UL Recognized component per UL 478 and a CSA Certified product per CSA C22.2 No. 220-M1986. It also meets the requirements of DIN IEC 380/VDE0806/8.81, DIN IEC 435/VDE 0805/11.84 and EN 60950/09.87. The WREN 2HH (AT interface), as delivered, is designed for system integration before use. It is supplied as a Class A Computing Device per the FCC Rules and Regulations, Part 15, Subpart J governing EMI of computing devices and the Radio Interference Regulations of the Canadian Department of Communications. The head, disc and actuator chamber (HDA) is environmentally sealed at the factory. Air is recirculated within the HDA and passes through a nonreplaceable filter to ensure the maintenance of a contamination free disc/actuator environment. The WREN 2HH uses a dedicated landing zone at the innermost radius of the media thus eliminating the possibility of destroying or degrading data by landing in the data zone. The WREN 2HH incorporate an automatic shipping look which prevents potential damage to the heads and discs caused by movements during shipping and handling. The shipping lock is automatically disengaged when power is applied to the drive. The WREN 2HH (AT interface) decodes Track 0 location from the dedicated servo surface thereby eliminating mechanical transducer adjustments and related reliability concerns. The WREN 2HH (AT interface) uses a high performance actuator assembly consisting of a low inertia, balanced, patented, straight arm driven by a highly efficient pancake coil assembly. This patended actuator mechanism provides excellent performance with minimal power dissipa- tion. Media Description ----------------- The media used on the WREN 2HH (AT interface) has a diameter of approximately 5 inches (130 mm). The aluminum substrate is coated with lubricated ferrous oxide which permits the heads to contacts the surface when starting and stopping. Media defects are characterized as beeing either correctable or un- correctable as a function of the type and magnitude of the media flaw. A 56 bit error correction code is used to identify and correct errors in the data read from the disc. In the WREN 2HH (AT interface) media certification is performed using the following standards: An error burst of 11 bits or less is a correctable error. An error burst greater than 11 bits in length is an un- correctable error. At the time of shipment from the point of manufacture, the WREN 2HH (AT interface) recording surfaces will meet the following requirements. 1. 948 total physical tracks per surface (94204-65/74). 1032 total physical tracks per surface (94204-71/81). 2. Track 0 to be error free on each data surface. 3. 30 defects per surface maximum. 4. Accumulative defects not to exceed one per megabyte, based on total available unformatted drive capacity. 5. Unidentified correctable errors shall not exceed two per surface. Seek Time --------- |WREN 2HH| ----------------------------------+--------+ Track-to-Track msec. typ. | 5 | Average msec. typ. | 29 | Average msec. max. | 65 | Latency msec. avg. | 8.34 | ----------------------------------+--------+ Seek time is defined as the time required from the receipt of a Seek Command by the WREN 2HH (AT interface) until the completion of the seek operation. Average seek time is determined by dividing the sum of the time for all possible seek movements by the total number of seek movements. Spindle Speed and Latency ------------------------- The spindle speed is 3597 0.5% r/min. The speed tolerance includes motor performance and motor control circuit tolerances. The average latency time is 8.34 milliseconds, based on a nominal disc speed of 3597 r/min. The maximum latency time is 16.76 milli- seconds based on a minimum disc speed of 3579 r/min. Host/Drive Interface data transfer rate --------------------------------------- Maximum instantaneous: 4,750 kbytes/s Maximum average: 830 kbytes/s Power Sequencing ---------------- Power sequencing is not required for the WREN 2HH. If the Delayed Motor Start jumper configuration is off, the slave drive motor start- up is delayed 20 seconds from power on. Temperature ----------- 50*F to 122*F (10*C to 50*C) operating ambient with a maximum gradient of 18* F (10* C) per hour. Above 1000 feet (305 metres) altidude the maximum temperature is derated linearly to 95* F (35*C) at 10,000 feet (3048 metres). Cabinet packaging designs must provide ample air circulation around the WREN 2 to ensure environmental limits are not exceeded as a result of heat transfer from other system components. Operating ambient for specification purposes is defined as the environment immediately surrounding the WREN 2. The temperature of the HDA is restricated to a maximum of 143*F (62* C) during operation. Write Precompensation Cylinder ------------------------------ The starting cylinder for write precompensation is controlled by the contens of this register. The starting physical cylinder is 4 times value in this register. This register is ignored by the WREN 2HH (AT interface). Use of write precompensation is controlled by the drive. Reliability ----------- The following reliability specifications assume correct host/drive operational interface has been implemented, including all interface timings, power supply voltages, environmental conditions, and appropriate data handling circuit to the host system. MTBF 40,000 hours Service Life 5 years Preventive Maintenance None required