W R E N I I 9 4 1 5 5 - 6 7 CDC NO MORE PRODUCED Native| Translation ------+-----+-----+----- Form 5.25"/FH Cylinders 925| | | Capacity form/unform 56/ 67 MB Heads 7| | | 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 % 20 80 | 5 95 standby W Altitude km -0.305 3.048| -0.305 12.192 idle W Shock g 2 | 32 seek 28.0 W Rotation RPM 3600 read/write W Acoustic dBA spin-up W ECC Bit MTBF h 40000 Warranty Month Lift/Lock/Park YES Certificates CSA,SDA,FCC,IEC380,IEC435,... ********************************************************************** L A Y O U T ********************************************************************** SEAGATE ST4086 PRODUCT MANUAL 77715909-H REAR +------------------------------------------------------------+ | | | | |Drive | |Select Terminator | | +----+ +--------+ Control Cable Power AC| +-+----+---+--------+------XXXXXXXXXXXXXXXXXXXX----XXXXXXX--x+ | | | Data Cable | +--------XXXXXXXXXXXXXXX-------------------------x------x----+ | W3 W4 | +------------------------------------------------------------+ AC = Quick Connect Terminal ********************************************************************** J U M P E R S ********************************************************************** SEAGATE ST4086 PRODUCT MANUAL 77715909-H Jumper setting ============== x = Jumper setting at factory J1 WREN Interface ------------------- Signal Direction Signal Direction +-----------+ +-------------+ | | |Signal Ground| | | Head Select 2(3) |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 J2 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 is defined as Reduced Write Current in the Seagate ST412 interface. The WREN 2 controls write current internally and thus the line is not needed for this function and is used instead for the fourth head select line. Note that this is a potential incompatibility with existing drives and controllers and applies to the WREN 2 in its full capacity versions only: Models 94155-86 (9 Data Heads, 86 MB). Reduced capacity WREN 2 models ignore the Reduced Write Current/Head Select 2(3) signal line, pin 2. J2 DC 506 Interface --------------------- Signal Direction Signal Direction +-----------+ +-------------+ | | |Pin No. Type*| | | Drive Selected | | | |<-------------------------------------+ 1 SE | | | Ground | | | +--------------------------------------+ 2 | | | Reserved | | | +--------------------------------------+ 3 SE | | | Ground | | | +--------------------------------------+ 4 | |Controller/| Reserved | | |Host +--------------------------------------+ 5 SE | |Interface | Ground | | | +--------------------------------------+ 6 | | | Reserved to J1 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 Jumper ------------------- +---+---+---+---+---+ | o | o | o | o | o | | o | o | o | o | o | +-+-+-+-+-+-+-+-+-+-+ | | | | +------ Radial Select Option | | | +---------- Drive Select 4 | | +-------------- Drive Select 3 | +------------------ Drive Select 2 +---------------------- Drive Select 1 Drive Select 1-2-3-4 -------------------- The following characteristics apply to the Drive Select lines: 1. Logical unit designation is established at the time of installation by setting the jumper plug located on the Servo PWA. 2. All control 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 Drive Ready input will be valid within 500 ns after the drive is selected (Drive Selected true) and after the 35 seconds power on delay. 6. The drive will be selected within 1 us after the activation of Drive Select, if the power on sequence is complete. The drive will be the deselected within 1-us after the deactivation of Drive Select. 7. The drive will activate the Drive Selected signal within 1 us after receipt of Drive Select if the drive is selected. The drive will deactivate Drive Selected within 1 us 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 us. 10. When the Drive Select line is activated, a ead change will occur, thus requiring a delay before a read or write operation can be initiated. DC Power Connector ------------------ +---+---+---+---+ | 1 | 2 | 3 | 4 | +--++--++--++--++ | | | +---------- + 5V | | +-------------- + 5V Return | +------------------ +12V Return +---------------------- +12V Signal/Chassis Ground --------------------- The WREN 2 Disc Drives are manufactured with the signal and chassis grounds common. Zero ohm resistors (designated W3 and W4) on the Data board allows modification of this relationship at the customer's option. The customer can select any of these grounding options by removing W3 and/or W4. W4 W3 Result ----------------------------------------------------------- x X X Grounds common, quick connect terminal tied to common ground X O Grounds separate, quick connect terminal tied to chassis ground O X Ground separate, quick connect terminal tied to signal ground O O Grounds separate, quick connect terminal float- ing X = Connected O = Not Connected (W4/W3 are located on the upperside of the printed circuit board) W3 and W4 zero ohm resistors are on the Data Boards of drives which are Series Code Five and above. The series code of the drive is indicated by the first two digits of the serial number, ie, 05000001. ********************************************************************** I N S T A L L ********************************************************************** SEAGATE ST4086 PRODUCT MANUAL 77715909-H 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! Maximum screw length into chassis bottom not more than 0.24 in. Maximum screw length into chassis side not more than 0.31 in. Drive Orientation ----------------- Only two drive mounting orientations are permitted: discs in the horizontal plane and discs in the vertical plane. The uppermost surface must be maintained in a level position or drive performance may be adversely affected. In the vertical plane, the drive may be mounted on either side, but not on either end. The drive may be not mounted inverted (upside down) in the horizontal orientation. It is recommended for optimum performance that data written in a given orientation be read in that same orientation. WREN 2 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 2 into an OEM's system, wether in a factory or field environment. WREN 2 CDC 506 interface ------------------------ The WREN 2 CDC 506 interface consists of a 34 pin command interface cable and a 20-pin data interface cable. This interface is compatible with the recognited industry standard ST506 interface. The 34 pin command interface is designed to allow daisychain or radial connections between the Host and WREN 2 Disc Drives. Cooling ------- Cabinet cooling must be designed by the customer so that the ambient temperature immediately surrounding the WREN 2 will not exceed temperature limits. Specific consideration should be given to ensure adequate air circulation around the heat sinks on the circuit board on the rear of the drive. Interface Cabling Options ------------------------- View A +---------------------Host-Controller---------------------+ | | |Data Control Data Control Data Control Data Control | +--+-----+--------+-----+--------+-----+--------+-----+---+ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | +-++-+--++-+-+ +-++-+--++-+-+ +-++-+--++-+-+ +-++-+--++-+-+ | |T | |*T| | | |T | |*T| | | |T | |*T| | | |T | |*T| | | +--+ +--+ | | +--+ +--+ | | +--+ +--+ | | +--+ +--+ | | WREN | | WREN | | WREN | | WREN | +------------+ +------------+ +------------+ +------------+ Each control cable length must not exceed 20 feet (6.10m). Each data cable length must not exceed 20 feet (6.10m). *T indicates removable terminator resistor pack. T indicates terminator resistor pack. WREN data cables are permanently terminated. Radial Configuration -------------------- View A shows each drive interfaced to its own control cable, which allows interfacing an arbitrary number of drives and a variety of system operational techniques. Each drive has its data cable and control 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 control cable. View B +---------------------Host-Controller---------------------+ | | |Data Control Data Data Data | +-+------+-------+--------------+--------------+----------+ | | | | | | | | | | | | | | | | +-------+Control+------+Control+------+Control+ +++-+----+---+ +++-+-----+--+ +++-+-----+--+ +++-+----++-++ ||T | | ||T | | ||T | | ||T | |*T|| |+--+ | |+--+ | |+--+ | |+--+ +--+| | WREN | | WREN | | WREN | | WREN | +------------+ +------------+ +------------+ +------------+ Total control cable length must not exceed 20 feet (6.10m). Each data cable length must not exceed 20 feet (6.10m). *T indicates removable terminator resistor pack. T indicates terminator resistor pack. WREN data cables are permanently terminated. Daisychain Configuration ------------------------ A daisychain configuration incorporates a maximum of four drives in parallel on a common control cable. Only the drive selected by the host system has its control and data signals enabled through this common interface. View B shouws four WREN Disc Drives only. A terminator resistor pack is required in the host controller for each data cable. Only the last WREN 2 in the daisychain requires a terminator resistor pack for the control cable. Terminator resistor packs for the control cable or other drives must be removed. The total combined control 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 2 receives DC power through a 4 pin right angle connector mounted on the servo circuit board. Recommended part number for the mating connector are provided, 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) 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 noncomponent side of the printed circuit board. The even pins are on the component side of the printed circuit board. A key slot is provided between pins 3 and 5. Seagate recommends keying this connector to prevent 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 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 Control Cable and Connector --------------------------- The I/O connector for the control interface is a 34 pin board edge connector. The odd pins are located on the component side of the printed circuit board and are connected to the ground plane. The even pins are on the noncomponent side of the printed circuit board. A key slot is provided between pin 3 and 5. Seagate recommends keying this connector to prevent 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 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 2 uses two types of signals -- single ended and balanced differential. The data and clock signals use balanced differential drivers and receivers. All other signals use single ended drivers and receivers. Single Ended Drivers/Receivers ------------------------------- Transmitter Characteristics The WREN 2 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 2 uses the 74LS14 Hex Inverter with hysteresis gate as a line receiver. The input of each receiver is terminated in a 220ohm/ 330 ohm resistor network. Terminator Characteristics The terminator is a resistor module that 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. An equivalent terminator must be provided in the controller on each input signal line from the drive to the controller. Only the control cable resistor module is removable. Balanced Differential Drivers/Receivers --------------------------------------- Transmitter Characteristics The WREN 2 uses 26LS31 type balanced differential driver. Logic 1 on the interface is defined when "+" output is more positive than the "-" output. Receiver Characteristics ------------------------ The WREN 2 uses 26LS32 type balanced differential receivers. A logic one 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. ********************************************************************** F E A T U R E S ********************************************************************** SEAGATE ST4086 PRODUCT MANUAL 77715909-H Standards --------- The 94155-YY WREN 2 has been developed as a system peripherals to the highest standards of design and construction. The WREN depends upon its 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 2 complies with Seagate standards. The WREN 2 is a UL Recognized component per UL478 and a CSA Certified product per CSA C22.2, No. 220-M1986. It also meets the requirements of DIN IEC380/VDE0806/8.81, DIN IEC 435/VDE 0805/11.84 and EN 60950/09.87. The WREN 2, 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. However, the WREN 2 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. Media Description ----------------- The media used in the WREN has a diameter of approximately 5 inches (130 mm). The aluminum substrate is coated with lubricated ferrous oxide to permit the heads to contact the surface when start- ing and stopping. Each data surface has total of 925 tracks and is capable of record- ing 9,634,800 bytes of unformatted data. Media defects are characterized as correctable or uncorrectable de- pending on the type and magnitude of the media flaw. Various error correction codes may be implemented, but the code chosen should be consistent with Seagate media testing and certification methods. In the WREN 2 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 2 should have, as a minimum, resident capabilities to recognize and map defective tracks and perform track reallocation routines. 1. 925 total tracks per surface. 2. Track 0 to be error free on each data surface. 3. 15 defects per surface maximum. 4. Cumulative 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 2 | ----------------------------------+--------+ Track-to-Track msec. typ. | 5 | msec. max. | 7 | Average msec. typ. | 28 | Average msec. max. | 32 | Maximum Seek Time msec. typ. | 65 | msec. max. | 70 | Latency msec. avg. | 8.33 | ----------------------------------+--------+ Seek time is defined as the elapsed time from the receipt of a seek command by the WREN 2 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. Spindle Speed and Latency ------------------------- The spindle speed is 3600 0.5% r/min. The speed tolerance includes motor performance and motor control circuit tolerances. The average latency time is 8.33 milliseconds, based on a nominal disc speed of 3600 r/min. The maximum latency time is 16.74 milli- seconds based on a maximum disc speed of 3582 r/min. Read Data Transfer Rate ----------------------- The nominal read serial data transfer rate is 5.0 Mbits per second. Start/Stop Time --------------- The WREN 2 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 WREN 2. Heat/Power Dissipation ---------------------- Each WREN 2 will dissipate no more than 33.5 watts (116 BTU's per hour) of DC power average. Typical power dissipation under nominal conditions is less than 28 watts. Air Cleanliness --------------- The WREN 2 is designed to operate in a typical office environment with minimum environmental control. Power Sequencing ---------------- Power sequencing is not required for the WREN 2. It protects against inadvertent writing during power up and down. Daisychain operation requires that power be maintained on the terminated unit to insure proper termination of the peripheral I/O cables. Temperature ----------- 50* to 122* F (10* to 50* C) Operating Ambient with a maximum gradient of 18* F (10* C) per hour. Above 1000 feet (305 meters) altitude the maximum temperature is derated linearly to 95* F (35* C) at 10,000 feet (3048 meters). 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 base casting should not be allowed to exceed 135*F (57* C) at the hottest point. The hottest point may vary between different applications. 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. An optional configuration which does not require write data precompensation may be specified for delivery. Nonprecompensation Operation ---------------------------- The Standard 94155 Wren require that the write data be precompensated 12 ns. Precompensation must start at or before cylinder 128 and address all cylinders beyond that point. An optional 94155 configuration is available at the users request which does not require write precompensation. This configuration must be specified at the time of order. Reliability ----------- The following reliability specifications assume correct host/drive operational interface implementation, 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