W R E N I I 9 4 1 5 6 - 8 6 CDC NO MORE PRODUCED Native| Translation ------+-----+-----+----- Form 5.25"/FH Cylinders 925| | | Capacity form/unform 72/ 87 MB Heads 9| | | Seek time / track 28.0/ 5.0 ms Sector/track | | | Controller ESDI Precompensation 65535 Cache/Buffer KB Landing Zone Data transfer rate 0.625 MB/S int Bytes/Sector 512 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 33.5 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,FCC,IEC380,IEC435,UL47... ********************************************************************** L A Y O U T ********************************************************************** SEAGATE ST4086E PRODUCT MANUAL 77738019-H REAR +------------------------------------------------------------+ | | | | |Drive | |Select Terminator | | +----+ +--------+ Control Cable Power AC| +-+----+---+--------+------XXXXXXXXXXXXXXXXXXXX----XXXXXXX--x+ | | | Data Cable | +--------XXXXXXXXXXXXXXX------------------------------x------+ | W4 | +------------------------------------------------------------+ FRONT +------------------------------------------------------------+ | | | | | +-------+SW1 | | +-------+ | +------PCB---------------------------------------------------+ | | | | +------PCB---------------------------------------------------+ | | +------------------------------------------------------------+ ********************************************************************** J U M P E R S ********************************************************************** SEAGATE ST4086E PRODUCT MANUAL 77738019-H Jumper setting ============== x = Jumpers set at factory Drive Select Header ------------------- Drive | 1 | 2 | 3 | ------+------+------+------+ x 1 |CLOSED|OPEN |OPEN | 2 |OPEN |CLOSED|OPEN | 3 |CLOSED|CLOSED|OPEN | 4 |OPEN |OPEN |CLOSED| 5 |CLOSED|OPEN |CLOSED| 6 |OPEN |CLOSED|CLOSED| 7 |CLOSED|CLOSED|CLOSED| Drive Select 0 is not allowed! Drive Select ------------ The following characteristics apply to the Drive Select lines: 1. Logical unit designation for up to 7 drives is performed during installation by installing the jumper on the baseboard assembly. 2. The controller shall not attempt to select the drive until 1 second after DC power is applied. The Ready output will be valid (whether true or false) within 500 ns after the drive is selected. 3. The drive will be selected (and the Drive Selected Signal true) within 1 us after the Drive Select lines contain that unit's select address. The drive will be deselected (and the Drive Selected signal false) within 1 us after the Drive Select lines contain another unit's select address. 4. The Drive Select lines must remain asserted for 1 us after a write operation. 5. When the Drive Select lines are asserted, a head change will occur, requiring a delay before a read or write operation can be initiated. SW1 Configuration switch setting --------------------------------- The WREN 2 is configured by turning on/off the switches in SW1 on the Servo PWA. SW1 is located behind the fron panel. Switch ON OFF ------ -- --- SW1-1 Factory Test Normal SW1-2 Motor Control* Motor Control Implemented Not Implemented SW1-7 Serial Mode Not Used Do not position switch to this setting Sectors/Track SW1-3 SW1-4 ------------- ----- ----- 17 ON ON 16 OFF ON 34 ON OFF 32 OFF OFF Format Mode SW1-5 SW1-6 ----------- ----- ----- Address Mark ON ON Byte Clock OFF ON Sector Pulse OFF OFF Sector Pulse ON OFF * When the SW1-2 switch is on, a Motor ON command is required from the controller to start the spindle motor. When power is applied to the drive, the drive will generate an Attention signal and assert Standard Status Bits 8 and 9 signifying "Power On Reset Conditions Exist" and "Spindle Motor Stopped". The controller must then respond with a command to Reset the Interace Attention line and also the Start Motor command in order to start the spindle motor. Note: This procedure is required every time the "Power On Reset Condition Exist" status bit is received by the controller if the "Motor Control Implemented" switch is on. AC/DC Ground ------------ The WREN 2 can be provided with the AC ground (chassis) isolated from the DC logic ground. This option may be benefical in reducing ground induced noise in some system applications. The WREN 2 is shipped with the DC ground and the chassis ground joined together. These two ground planes may be separated by removing W4 from the Data PWA. Power Connector --------------- +---+---+---+---+ | 1 | 2 | 3 | 4 | +--++--++--++--++ | | | +---------- + 5V | | +-------------- + 5V Return | +------------------ +12V Return +---------------------- +12V ********************************************************************** I N S T A L L ********************************************************************** SEAGATE ST4086E PRODUCT MANUAL 77738019-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! 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. 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 make 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 10 feet (3.00m). Each data cable length must not exceed 10 feet (3.00m). *T indicates removable terminator resistor pack. WREN data ports 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 10 feet (3.00 meters). Terminator resistors must be installed in the host controller for each data cable and for each control cable. For this configuration, a terminator resistor pack must be installed in each WREN 2 Disc Drive. View B +--------------Host Controller-------------+ | | |Data Control Data Data | +-+------+-------+--------------+----------+ | | | | | | | | | | | | | +--**---+-------+------+-------+ +++-+----+---+ +++-+-----+--+ +++-+-----+--+ ||T | | ||T | | ||T | | |+--+ | |+--+ | |+--+ | | WREN #1 | | WREN #6 | | WREN #7 | +------------+ +------------+ +------------+ Total control cable length must not exceed 10 feet (3.00m). Each data cable length must not exceed 10 feet (3.00m). *T indicates removable terminator resistor pack. WREN data ports are permanently terminated. Daisychain Configuration ------------------------ A daisychain configuration incorporates parallel interfacing of the drives on a common control cable. A maximum of seven drives may be daisychained on the control cable in the serial mode of operation. Only the drive selected by the host system has its control signals enabled through this common interface. View B illustrates a daisychain of WREN 2 Disk Drives. 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 10 feet (3.00 meters). DC Cable and Connector ---------------------- The WREN 2 receives DC power through a 4 pin right angle connector mounted on the Servo PWA. Recommended part numbers of 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) DC ground Connector ------------------- The WREN 2 is shipped with the DC ground and the chassis ground joined together. These two ground planes may be separated by re- moving W4 from the Data PWA. 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 PWA. The even pins are on the component side of the PWA. A key slot is provided between pins 3 and 5. Seagate recommends keying this connector to prevent installing it upside down. However, the WREN will not be damaged if the connector is installed upside down. Recommended part numbers for the mating connector are listed 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 PWA and are connected to the ground plane. The even pins are on the noncomponent side of the PWA. A key slot is provided between pin 3 and 5. Seagate recommends keying this connector to prevent installing it upside down. However, the WREN will not be damaged if the connector is installed 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 7438 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 150 ohm pullup resistor. 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 balanced differential driver. A 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 1 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 ST4086E PRODUCT MANUAL 77738019-H Standards --------- The WREN 2 has been developed as a system peripherals to the highest standards of design and construction. The WREN 2 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 IEC 380/VDE 0806/8.81, 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 Calss 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 2 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 starting and stopping. Each data surface has a total of 925 tracks and is capable of recording 9,657,000 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. 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. Defect and Error Management --------------------------- The WREN 2, as delivered, complies with this specification. The read error rate and specified storage capacity are not dependent upon defect management routines. However, a carefully chosen defect management plan can significantly enhance overall system performance. Identified defects are recorded on the defects list tracks per ESDI specification. It is recommended that these known defects be re- allocated during the initial format operation. Sector reallocation is suggested because, in general, it is more efficient and may offer significant performance improvement. Error Correction Code (ECC) should be used to correct additional flaws as they occur. ECC is re- commended since most of the defects are recoverable with ECC. If ECC is not used, defects are usually unrecoverable and need to be re- allocated as they are discovered. Custom Formatting ----------------- The WREN 2 is formatted during production. Seagate maintains custom formatting capability which can incorporate many of the unique formats used in the Winchester marketplace. A majority of special format requirements can be implemented as specified. Drive/Receiver Characteristics ------------------------------ Logic Level Drive Output Receiver Input -------------------------------------------------------------------- High (false/deactivated) (0) 2.4 V; 5.25 V 2.0 V; 5.25 V Low (true/activated) (1) 0.4 V; 0.0 V 0.8 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 | 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 minimum disc speed of 3582 r/min. Read Data Transfer Rate ----------------------- The read serial data transfer rate is 5.0 Mbits per second. Power Sequencing ---------------- Power sequencing is not required for the WREN 2. The drive 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 cables. 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 base casting should not be allowed to exceed 135* F (57* C) at the hottest point. The hottest point may vary dependent upon application. Air Cleanliness --------------- The WREN 2 is designed to operate in a typical office environment with minimum environmental control. Options ------- All options are either incorporated or packaged at the manufacturing facility. However, separation of AC and DC ground can be accomplished by the user at some later time if desired. Front Panel ----------- The WREN 2 is available with a black front panel. The panel has a single red rectangular LED indicator which, when glowing, indicates the drive is selected. A flashing indication displays the presence of a nonrecoverable fault. A fault indication is displayed irrespective of Drive Select status. Reliability ----------- The following reliability specifications assume correct host/drive operational interface implementation, including all interface timings, power supply voltages, and environmental conditions. MTBF 40,000 hours Service Life 5 years Preventive Maintenance None required