W R E N I I H H 9 4 2 0 5 - 5 1 CDC NO MORE PRODUCED Native| Translation ------+-----+-----+----- Form 5.25"/HH Cylinders 989| | | Capacity form/unform 43/ 52 MB Heads 5| | | Seek time / track 28.0/ 5.0 ms Sector/track 17| | | Controller MFM / ST506 Precompensation 128 Cache/Buffer KB Landing Zone Data transfer rate 0.625 MB/S int Bytes/Sector 512 0.625 MB/S ext Recording method MFM 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 MTBF h 40000 Warranty Month Lift/Lock/Park YES Certificates CSA,FCC,IEC380,UL478,VDE ********************************************************************** L A Y O U T ********************************************************************** SEAGATE ST253 PRODUCT MANUAL 77738213-E +------------------------------------------------------+ | |XX Power | |XX | | | Terminator++ |X1 Control | Resistor || |XX Cable | || |XX Connector | +1 |XX | |XX | Drive +-+ |XX | Select | | |XX | Jumper | | | | +-+ |X1 Data | |XX Cable | |XX Connector | |XX | |XX +------------------------------------------------------+ ********************************************************************** J U M P E R S ********************************************************************** SEAGATE ST253 PRODUCT MANUAL 77738213-E Jumper setting ============== Drive Select Jumper ------------------- +------------+--------------------+ | | 1 2 3 4 5 6 7| +------------+--------------------+ |Drive 1 | X o o o o o o| | | X o o o o o o| +------------+--------------------+ |Drive 2 | o X o o o o o| | | o X o o o o o| +------------+--------------------+ |Drive 3 | o o X o o o o| | | o o X o o o o| +------------+--------------------+ |Drive 4 | o o o X o o o| | | o o o X o o o| +------------+--------------------+ |Radial | o o o o X o o| | | o o o o X o o| +------------+--------------------+ |Reserved | o o o o o X o| | | o o o o o X o| +------------+--------------------+ |Reserved | o o o o o o X| | | o o o o o o X| +------------+--------------------+ WREN Interface Control Cable ---------------------------- Signal Direction Signal Direction +-----------+ +-------------+ | | |Signal Ground| | | Terminated |No. No. | | +------------------------------------->| 2 1 | | | Head Select 2(2) | | | +------------------------------------->| 4 3 | | | Write Gate | | | +------------------------------------->| 6 5 | | | Seek Complete | | | |<-------------------------------------+ 8 7 | |Controller/| Track 0 | | |Host |<-------------------------------------+ 10 9 | |Interface | Write Fault | | | |<-------------------------------------+ 12 11 | | | Head Select 2(0) | | | +------------------------------------->| 14 13 | | | Reserved to J3 pin 7 | | | +--------------------------------------+ 16 15 | | | Head Select 2(1) | | | +------------------------------------->| 18 17 | | | Index | | | |<-------------------------------------+ 20 19 | | | Ready | | | |<-------------------------------------+ 22 21 | | | Step | | | +------------------------------------->| 24 23 | | | Drive Select 1 | | | +------------------------------------->| 26 25 | | | Drive Select 2 | | | +------------------------------------->| 28 27 | | | Drive Select 3 | | | +------------------------------------->| 30 29 | | | Drive Select 4 | | | +------------------------------------->| 32 31 | | | Direction In | | | +------------------------------------->| 34 33 | | | | | +-----------+ +-------------+ WREN Control Cable Connector All signals in the control cable are single ended signals. Pin 2 in the control cable (Head Select 2(3) is defined as Reduced Write Current in the Seagate ST412 interface. The WREN II HH controls write current internally, and thus the line is not needed for this function and is terminated. DC 506 Interface Data Cable --------------------------- Signal Direction Signal Direction +-----------+ +-------------+ | | |Pin No. Type*| | | Drive Selected | | | |<-------------------------------------+ 1 SE | | | Ground | | | +--------------------------------------+ 2 | | | Reserved | | | +--------------------------------------+ 3 SE | | | Ground | | | +--------------------------------------+ 4 | |Controller/| Motor On (Option) | | |Host +--------------------------------------+ 5 SE | |Interface | Ground | | | +--------------------------------------+ 6 | | | Reserved to J4 Pin 16 | | | +--------------------------------------+ 7 | | | Ground | | | +--------------------------------------+ 8 | | | Reserved | | | +--------------------------------------+ 9 | | | Reserved | | | +--------------------------------------+ 10 | | | Ground | | | +--------------------------------------+ 11 | | | Ground | | | +--------------------------------------+ 12 | | | +MFM Write Data | | | +------------------------------------->| 13 DIFF| | | -MFM Write Data | | | +------------------------------------->| 14 DIFF| | | Ground | | | +--------------------------------------+ 15 | | | Ground | | | +--------------------------------------+ 16 | | | +MFM Read Data | | | |<-------------------------------------+ 17 DIFF| | | -MFM Read Data | | | |<-------------------------------------+ 18 DIFF| | | Ground | | | +--------------------------------------+ 19 | | | Ground | | | +--------------------------------------+ 20 | | | | | +-----------+ +-------------+ Data Cable Connector * SE = Single Ended Signal DIFF = Differential Signal Drive Select 1-2-3-4 -------------------- These lines are used to activate a device's drivers and receivers for up to four drives in a daisychained operation. The following characteristics apply to the DRIVE SELECT lines: 1. Logical unit designation is accomplished at the time of installation by setting the jumper plug located on the baseboard assembly. 2. All command cable lines are gated with Drive Select. No data cable signal lines are gated with Drive Select. 3. Drive Select must remain active during any communication with the host controller. 4. When the radial select jumper is installed, the drive will be selected all the time. 5. The drive should not be selected until 1 second after DC power is applied. The Ready input will be valid within 500 ns after the drive is selected (Drive Selected true) and after the power on delay. 6. The drive will be selected within 1 s after the activation of Drive Select, if the power on sequence is complete. The drive will be the deselected within 1 s after the deactivation of Drive Select. 7. The drive will activate the Drive Selected signal within 1 s after receipt of Drive Select if the drive is selected. The drive will deactivate Drive Selected within 1 s after the Drive Select signal is deactivated. 8. Drive Select must be valid 100 ns minimum before the first step pulse is received and 100 ns minimum after the last step pulse is received. 9. At the completion of a write operation, Drive select must remain active for 1 s. 10. When the Drive Select line is activated, a head change will occur, thus requiring a delay of 5 s before a read or write operation can be initiated. 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 ST253 PRODUCT MANUAL 77738213-E 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! Drive Orientation ----------------- The permissible drive mounting orientations include operation in the horizonatal plane and in the vertical plane. Mounting with either end down (front or rear) is not permissible. An angle of (TBD) is acceptable for both horizontal and vertical orientations. WREN II HH is designed, manufactured, and tested with a "Plug-in and Play" installation philosophy. This minimizes the requirements for highly trained personnel to integrate the WREN II HH 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 II HH will not exceed temperature conditions. Interface Cabling Options ------------------------- View A +---------------------Host-Controller---------------------+ | | |Data Command Data Command Data Command Data Command | +--+-----+--------+-----+--------+-----+--------+-----+---+ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | +-++-+--++-+-+ +-++-+--++-+-+ +-++-+--++-+-+ +-++-+--++-+-+ | |R | | T| | | |R | | T| | | |R | | T| | | |R | | T| | | +--+ +--+ | | +--+ +--+ | | +--+ +--+ | | +--+ +--+ | | WREN | | WREN | | WREN | | WREN | +------------+ +------------+ +------------+ +------------+ Each command cable length must not exceed 20 feet (6.10m). Each data cable length must not exceed 20 feet (6.10m). T indicates terminator resistor pack. R indicates discrete terminator. WREN data cables are permanently terminated. Radial Configuration -------------------- View A shows each drive interfaced to its own command cable, which allows interfacing of any number of drives and a variety of system operational techniques. Each drive has its data cable and command cable radially connected to the host controller. The length of each individual cable must not exceed 20 feet (6.10 meters). Terminator resistors must be installed in the host controller for each data cable and for each command cable. View B +---------------------Host-Controller---------------------+ | | |Data Command Data Data Data | +-+------+-------+--------------+--------------+----------+ | | | | | | | | | | | | | | | | +-------+Command+------+Command+------+Command+ +++-+----+---+ +++-+-----+--+ +++-+-----+--+ +++-+----++-++ ||R | | ||R | | ||R | | ||R | | T|| |+--+ | |+--+ | |+--+ | |+--+ +--+| | WREN | | WREN | | WREN | | WREN | +------------+ +------------+ +------------+ +------------+ Total command cable length must not exceed 20 feet (6.10m). Each data cable length must not exceed 20 feet (6.10m). T indicates terminator resistor pack. R indicates discrete terminator. WREN data cables are permanently terminated. Daisychain Configuration ------------------------ A daisychain configuration incorporates a parallel interfacing on the disc drives on a common command cable. A maximum of four drives may be daisychained on the command cable. Only the drive which is selected by the host system has its control and data signals enabled through this common interface. View B consists of four WREN II HH Disc Drives only. Only the last WREN II HH in the daisychain requires a terminator resistor pack for the command cable. Terminator resistor packs for the command cable or other drives are removed. The total combined command cable length (from the controller to the first drive, to the second and subsequent drives) must not be more than 20 feet (6.1 meters). DC Cable and connector ---------------------- The WREN II HH receives DC power through a 4 pin right angle connector mounted on the main circuit board. Recommended part number 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 II HH 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. Data Cable and Connector ------------------------ The I/O connector for the data interface is a 20 pin board edge connector. The odd pins are located on the front side of the printed circuit board. The even pins are on the back side of the printed circuit board. A key slot is provided between pins 3 and 5. CDC recommends keying this connector to prevent the possibility of installing it upside down. Recommended part numbers for the mating connector are included below, but equivalent parts may be used. Connector: 20 pin, 3M-3461-0001, AMP 88373-6 or AMP 111109-3 Cable: Flat Cable (Stranded AWG 28) 3M-3365-20 Flat Cable (Stranded AWG 28) 3M-3517-20 (Shielded Cable) Key: AMP 583274-1, 3M-3439-0000 Command Cable and Connector --------------------------- The I/O connector for the command interface is a 34 pin board edge connector. The odd pins are located on the front side of the printed circuit board and are connected to the ground plane. The even pins are on the back side of the printed circuit board. A key slot is provided between pin 3 and 5. CDC recommends keying this connector to prevent the possibility of installing it upside down. Recommended part numbers for the mating connector are included below, but equivalent parts may be used. Connector: 34 pin, 3M-3463-0001, AMP 88373-3 or AMP 111109-3 Key: AMP 583274-1, 3M-3439-0000 Cable: Flat cable (Stranded AWG 28) 3M-3365-34 Flat cable (Stranded AWG 28) 3M-3517-34 (Shielded Cable) Spectra Strip Twist'n Flat 455-248-34 (Stranded AWG 28 Twisted Pair) Interface Drivers/Receivers --------------------------- The WREN II HH uses both single ended and balanced differential signals on the I/O. The data signals use balanced differential drivers and receivers. All other signals use single ended drivers and receivers. Single Ended Drivers/Receivers ------------------------------- Transmitter Characteristics The WREN II HH uses the 74F38 open collector quad-2-input driver to transmit status to the host. This driver is capable of sinking a current of 48 mA with a low-level output voltage of 0.4V. Receiver Characteristics The WREN II HH uses the 74LS14 Hex Inverter with hysteresis gate as a line receiver. The input of each receiver is terminated in a 220/330 ohm resistor network. Terminator Characteristics The terminator consists of a resistor module which plugs into a socket in the last drive in a daisychain. Each drive is furnished with a terminator. Terminators must be removed from all except the last drive on the cable prior to daisychain operation. The terminator can be easily removed with tweezers or needlenose pliers. Terminator installation will, however, require some disassembly of the drive. An equivalent terminator must be provided in the controller on each input signal line from the drive to the controller. Only the Command cable resistor module is removable. Balanced Differential Drivers/Receivers --------------------------------------- Transmitter Characteristics The WREN II HH uses 75158 type balanced differential driver. Logic 1 on the interface is defined when the "+" output is more positive than the "-" output. Receiver Characteristics ------------------------ The WREN II HH uses 75157 type balanced differential receivers. Logic 1 on the interface is defined when the "+" input is more positive than the "-" input. Terminator Requirements ----------------------- Each differential receiver in the drive is terminated with a 100 ohm resistor. An equivalent terminator must be provided in the controller on each input signal line from the drive to the controller. Digital Interface Signal Definitions ------------------------------------ The WREN II HH uses the two cable (command and data) interface for information transfer between it and the controller/host system. (All single ended signals are true when the interface voltage level is less than 0.4 volts.) Remote Motor Start Option ------------------------- The WREN II HH will support remote start control capability via a user specified option. This option utilizes a reserved line on the data cable (pin number 5) to enable the motor ON routine in the drive. If this option is not selected, Pin 05 will be open and non- functional. If this option is installed, Pin 05 will start the spindle concurrent with a high level. ********************************************************************** F E A T U R E S ********************************************************************** SEAGATE ST253 PRODUCT MANUAL 77738213-E Standards --------- The 94205-XX WREN II HH has been developed as a system peripherals to the highest standards of design and construction. The WREN depends upon its 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 II HH is a UL Recognized component per UL478 and a CSA Certified product per CSA C22.2, No. 154-M1983. It also meets the requirements of DIN IEC 380/VDE 0806/8.81. The WREN II HH, 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. However, the WREN II HH has been tested and found to comply with the Class B requirements of the referenced FCC Rules and Regulations when installed in a typical commercial computing system. 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 a contamination free disc/actuator environment. The WREN II HH 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 II HH incorporates an automatic shipping look which prevents potential damage to the heads and disks caused by movements during shipping and handling. The shipping lock is automatically disengaged when power is applied to the drive. The WREN II HH decodes Track 0 location from the dedicated servo surface thereby eliminating mechanical transducer adjustments and related reliability concerns. The WREN II HH uses a high performance actuator assembly consisting of a low inertia, balanced, straight arm driven by a by a highly efficient pancake coil assembly. This actuator mechanism (patent pending) provides excellent performance with minimal power dissipation. Media Description ----------------- The media used on the WREN has a diameter of approximately 5 inches (130 mm). The aluminum substrate is coated with lubricated ferrous oxide which permit the heads to contact the surface when starting and stopping. Each data surface has total of 989 tracks and is capable of record- ing 10,301,424 bytes of unformatted data. Media defects are characterized as beeing either correctable or uncorrectable as a function of the type and magnitude of the media flaw. Various error correction codes may be implemented to correct errors in the data read from the disk. However, the code chosen should be consistent with Control Data media testing and certification methods. In the WREN II HH 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. Host systems using the WREN II HH should have, as a minimum, resident capabilities to recognize and map defective tracks and perform track reallocation routines. At the time of shipment from the point of manufacture, the WREN II HH recording surfaces will meet the following requirements. 1. 989 total tracks per surface. 2. Track 0 to be error free on each data surface. 3. 15 defects per surface maximum. 4. Accumulative defects not to exceed 1 per megabyte, based on total available unformatted drive capacity. Driver/Receiver Characteristics ------------------------------- Logic Level Drive Output Receiver Input -------------------------------------------------------------------- High (false/deactivated) (0) 2.5 V; 5.25 V 2.0 V; 5.25 V Low (true/activated) (1) 0.4 V; 0.0 V 0.5 V; 0.0 V The difference in the voltages between input and output signals is due to the losses in the cable. Seek Time --------- | WREN II| ----------------------------------+--------+ Track-to-Track msec. typ. | 5 | msec. max. | 8 | Average msec. typ. | 28 | Average msec. max. | 32 | Maximum Seek Time msec. typ. | 65 | msec. max. | 70 | Latency msec. avg. | 8.34 | ----------------------------------+--------+ Seek time is defined as the elapsed time from the receipt of a seek command by the WREN II HH until the drive signals the controller that it is ready to perform another seek, or a read/write function on the new cylinder. Average seek time is determined by dividing the sum of the time for all possible movements by the total number of movements. Start/Stop Time --------------- The WREN II HH will become ready less than 35 seconds after application of DC power. Stop time will be less than 30 seconds after removal of DC power. There is no power control switch on the drive. 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 maximum disc speed of 3579 r/min. Read Data Transfer Rate ----------------------- The nominal read serial data transfer rate is 5.0 Mbits per second. Air Cleanliness --------------- The WREN II HH is designed to operate in a typical office environment with minimum environmental control. Power Sequencing ---------------- Power sequencing is not required for the WREN II HH. It protects against inadvertent writing during power up and down. Daisychain operation requires that power be maintained on the terminated unit to ensure proper termination of the peripherals I/O. Heat/Power Dissipation ---------------------- Each WREN II HH will typically dissipate 20 watts (68 BTU per hour) of power during operation (seeking). Idle mode power dissipation is less than 18 watts, typically. 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 112* F (44*C) at 10,000 feet (3048 metres). Cabinet packaging designs must provide ample air circulation around the WREN II HH to make sure 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 II HH. The temparature of the HDA is restricted to a maximum of 143*F (62*C) during operation. Write Precompensation --------------------- MFM Write Data must conform to the conventional MFM encoding rules and must be write precompensation by 12 ns per the industry standard MFM data write precompensation rules. Write precompensation is recommended on all tracks; however, write precompensation must be performed on tracks greater than Track 128. 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 circuits in the host system. MTBF 40,000 hours Service Life 5 years Preventive Maintenance None required