W R E N V I 9 4 1 9 6 - 3 8 3 CDC NO MORE PRODUCED Native| Translation ------+-----+-----+----- Form 5.25"/FH Cylinders 1632| | | Capacity form/unform 338/ 383 MB Heads 7| | | Seek time / track 17.0/ 3.0 ms Sector/track 54| | | Controller ESDI Precompensation 65535 Cache/Buffer KB Landing Zone Data transfer rate 1.875 MB/S int Bytes/Sector 512 MB/S ext Recording method RLL 2/7 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 W Shock g 2 | 32 seek W Rotation RPM 3600 read/write 20.0 W Acoustic dBA spin-up W ECC Bit MTBF h 100000 Warranty Month Lift/Lock/Park YES Certificates CSA,IEC380,IEC435,UL478,VDE ********************************************************************** L A Y O U T ********************************************************************** SEAGATE ST4766E PRODUCT MANUAL 77765358-K +--------------------------------------------------------+ | +-+ |XX J4 | J9| | |XX Data | | | |XX Cable | +-+ |XX | ++1 |X1 | Terminator || | | Resistor || |XX | Pack || |XX J3 | ++ |XX Control | +-1 |XX Cable | J12-+ |XX | +-+ |XX | J8| | |XX | | | |X1 | +-+ | | |XX Power | |XX J1 +--------------------------------------------------------+ 1 ********************************************************************** J U M P E R S ********************************************************************** SEAGATE ST4766E PRODUCT MANUAL 77765358-K Jumper setting ============== x = Jumpers are set at factory J1 Power Connector ------------------- +---+---+---+---+ | 1 | 2 | 3 | 4 | +--++--++--++--++ | | | +---------- + 5V | | +-------------- + 5V Return | +------------------ +12V Return +---------------------- +12V J8 Drive Select ---------------- +--+--+--+--+--+--+--+ J8|o |o |o |o |o |o |x | ++-++-++-++-++-++-++-+ | | | | | | +----- Drive Select 1 | | | | | +-------- Drive Select 2 | | | | +----------- Drive Select 3 | | | +-------------- Drive Select 4 | | +----------------- Drive Select 5 | +-------------------- Drive Select 6 +----------------------- Drive Select 7 Note: Unit select zero (no jumper) is invalid! Pins on the drive ID select and configuration select header are provided to facilitate manual drive configuration. No devices other than jumpers should be connected to these pins. Connection to external devices (Switches, Connectors, etc.) could adversely affect drive performance. Exact location of these pins and header may be changed without notice. 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 jumpers on pins on a connector header on the main PWA. The jumpers are installed in a 1 through 7 position configuration to select device addresses 1 through 7. Zero is not a valid address. 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 asserted or negated) within 1 us after the drive is selected. 3. The drive will be selected (and the Drive Selected Signal asserted) within 1 us after the Drive Select lines contain that unit's select address. The drive will be deselected (and the Drive Selected signal negated) 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. J9 Sector Configuration ----------------------- +-----------+-------------------------------------------------+ (1) | | Jumper Plug | +-----------+-------------------------------------------------+ | Sectors | 1 2 3 4 5 6 | +-----------+-------------------------------------------------+ | 96 | (3) OFF OFF OFF (5) (6) | | 53 | (3) OFF OFF ON (5) (6) | (2) | Undefined | (3) OFF ON OFF (5) (6) | | Special | (3) OFF ON ON (5) (6) | (7) | 54 | (3) ON OFF OFF (5) (6) | | 51 | (3) ON OFF ON (5) (6) | | Undefined | (3) ON ON OFF (5) (6) | | Address | (3) ON ON ON (5) (6) | (4) | Mark | | +-----------+-------------------------------------------------+ (1) ON - Plug installed; OFF - plug removed (2) The configurations of installed jumper plugs are selected according to a customer configurator document. However, this configuration is the most commonly shipped configuration. (3) Motor Start Option Jumper - If installed the drive requires a motor start command to spin up. (4) Soft Sector Option The WREN 6 supports the use of the soft sector format as described in the ESDI Specification, 77738076, Section 5.4.4. To implement the optional soft sectored format operation, select "Address Mark" mode in the WREN 6 by installing option jumper plugs 2, 3, and 4. (5) Factory use only. (6) Reserved (7) Special sector switch setting that can be factory configured to customer requirements. J12 Write Protect ------------------ The WREN 6 has available a write protect feature that will allow the entire drive to be write protected. The write protection is enabled by connecting pins 1 and 3 on header J12, or alternately, connecting pin 2 of header J12 to DC ground. When the write protection is enabled the drive will inhibit the controller from writing to any cylinder or head, however the drive will still be fully capable of performing all other protected by responding to a Standard Status request (2000H) with bit 12 set to one. If the controller asserts WRITE GATE while the write protection is enabled the drive will respond with setting ATTENTION and by indicat- ing a write fault (setting bit one) in response to a Standard Status request (2000H). Write protection can be removed by disconnecting pin 2 of header J12 from pin 1 or from DC ground. ********************************************************************** I N S T A L L ********************************************************************** SEAGATE ST4766E PRODUCT MANUAL 77765358-K 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. Mounting with either end down (front or rear) is not permissible. 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. The WREN 6 is designed, manufactured, and tested with a "Plug-in and Play" installation philosophy. This philisophy minimizes the requirements for highly trained personnel to integrate the WREN 6 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 6 will not exceed temperature conditions. Specific consideration should be given to make sure adequate air circulation is present around the circuit board at 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 OR ESDI| |WREN OR ESDI| |WREN OR ESDI| |WREN OR ESDI| +------------+ +------------+ +------------+ +------------+ Each cable control 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 connected to the host controller. The length of each individual cable must not exceed 10 feet (3.0 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 6 Disc Drive. The orientation of Pin 1 of the terminator resistor matters. View B +--------------Host Controller-------------+ | | |Data Control Data Data | +-+------+-------+--------------+----------+ | | | | | | | | | | | | | +--**---+-------+------+-------+ +++-+----+---+ +++-+-----+--+ +++-+----++-++ ||T | | ||T | | ||T | |*T|| |+--+ | |+--+ | |+--+ +--+| |WREN OR ESDI| |WREN OR ESDI| |WREN OR ESDI| +------------+ +------------+ +------------+ 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. ** A maximum of 7 devices may be interconnected. Daisychain Configuration ------------------------ A daisychain configuration connects a maximum of seven drives in parallel on a common control cable. Only the drive selected by the host system has its control signals enabled through this common interface. View B illustrates a daisychain of WREN 6 disk drives or other ESDI devices. A terminator resistor pack is required in the host controller for each data cable. Only the last ESDI device 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 6 receives DC power through a 4 pin right angle connector mounted on the main circuit board. Recommended part number 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) 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 back (up) side of the printed circuit board. The even pins are on the front (down) 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. 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: 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 back (up) side of the printed circuit board and are connected to the ground plane. The even pins are on the front (down) 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. However, the WREN will not be damaged if the connector is installed upside down. Recommended part numbers for the mating connector are provided, 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 6 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 6 uses the 74F38 open collector buffer/driver to transmit status to the host. This driver is capable of sinking a current of 40 mA with a low-level output voltage of 0.7 V. Receiver Characteristics The WREN 6 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. Note orientation of pin 1. 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 6 uses 8923 type balanced differential driver. An assertion on the interface is defined when "+" output is more positive than the "-" output. Receiver Characteristics ------------------------ The WREN 6 uses 8923 type balanced differential receivers. An assertion 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 ST4766E PRODUCT MANUAL 77765358-K Standards --------- The WREN 6 has been developed as a system peripherals to the highest standards of design and construction. The WREN 6 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 6 complies with Seagate standards. The WREN 6 is a UL Recognized component per UL478 and a CSA Certified Component per CSA C22.2, No. 220-M1986. It also meets the requirements of DIN IEC 380/VDE 0806/8.81. The WREN 6, as delivered, is designed for system integration before use. It is supplied as a sub-assembly. As such, it is not directly subject to the FCC Rules and Regulations, Part 15, Subpart J govern- ing EMI of computing devices end the Radio Interference Regulations of the Canadian Department of Communications. Media Description ----------------- The media used in the WREN 6 has a diameter of approximately 5 inches (130 mm). The aluminum substrate is coated with a thin film magnetic material, and lubricated to permit the heads to contact the surface when starting and stopping. Each data surface has a total of 1632 tracks (Model 94196-766) and is capable of recording 51,144,240 bytes of unformatted data. The Model 94196-383 has 1747 tracks and 54,716,04 data bytes per surface. 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. WREN 6 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 6 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 6 recording surfaces will meet the following requirements. 1. 1632 (Model 94196-766) or 1747 (Model 94196-383) total tracks per surface. 2. Track 0 to be error free on each data surface. 3. 50 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 6, as delivered, complies with this specification. The read error rate and specified storage capacity are not dependent upon use of defect management routines. The error rate specification does assume that the sectors with defect in the defect log are de- allocated. However, a carefully chosen defect management plan can significantly enhance overall system performance. Identified defects are recorded on the defects list tracks per Seagate ESDI specification. It is recommended that these known defects be reallocated 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 recommended since most of the defects are recoverable with ECC. If ECC is not used, defects are usually unrecoverable and need to be reallocated as they are discovered. The WREN 6 defect list is written on maximum track, maximum track minus eigth and a special track 4095 on each surface in the format given in the ESDI Specification, with the write splice byte omitted from the format. To successfully read the drive defect list on the standard drive the Read Gate must be asserted only at the first bit of the first byte of the PLO sync field that follows the drive ISG field immediately following Index. Read gate should not be toggled and reasserted after the address field and before the data field. The ISG field can be determined by using the Request Configuration Command (code 3700H). An option is available upon customer request to have the defect list formatted with a write splice byte between the address and data fields. This would then allow for the reassertion of Read Gate after the address field and prior to the data field. Custom Formatting ----------------- The WREN 6 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 ------------------------------ Interface signal levels and logical sense at the WREN I/O connector are defined as follows: Logic Level Drive Output Receiver Input ------------------------------------------------------------- High (negated) (0) 2.5 V; 5.25 V 2.0 V; 5.25 V Low (asserted) (1) 0.7 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 --------- |94196-766|94196-383 ----------------------------------+---------+--------- Track-to-Track msec. typ. | 3 | 3 msec. max. | 4 | 4 Average msec. typ. | 15.5 | 17 Average msec. max. | 17.5 | 19 Latency msec. avg. | 8.33 | 8.33 ----------------------------------+---------+--------- Seek time is defined as the elapsed time from the receipt of a seek command 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 times for all possible movements by the total number of movements. Spindle Speed and Latency ------------------------- The spindle speed is 3600 1% 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 16.67 milli- seconds based on a minimum disc speed of 3564 r/min. Read Data Transfer Rate ----------------------- The read serial data transfer rate is 15.0 Mbits per second, 1.875 Megabytes per second. Start/Stop Time --------------- The WREN 6 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 6. Power Sequencing ---------------- Power sequencing is not required for the WREN 6. 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 36* F (20* C) per hour. The maximum temperature is derated linearly 1.8* F per 1640 feet (1* C per 500 metres). Cabinet packaging designs must provide ample air circulation around the WREN 6 to ensure environmental limits are not exceeded as a result of heat transfer from other system components. Operating ambient is defined as the average temperature 0.25 inch outward from the top of the drive chassis at the middle of the drive (lengthwise). The temperature of the top cover must not exceed 140* F (60* C) when measured at the center of the drive. Heat/Power Dissipation ---------------------- Each WREN 6 will dissipate no more than 27.0 watts (105.8 BTUs per hour) of DC power average. Typical power dissipation under idle operating conditions is less than 20 watts. Air Cleanliness --------------- The WREN 6 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. Front Panel ----------- The WREN 6 is available with a black front panel. The panel has a window through wich a single red* LED shows from its mounting on the Main PWA. The LED, when glowing, indicates the presense of a non- recoverable fault. A fault indication is displayed irrespective of Drive Select status. *Green for Amber LED indicator will be available, but must be specified when ordering units. Reliability ----------- The following reliability specifications assume correct host/drive operational interface has been implemented, including all interface timings, power supply voltages, and environmental conditions. MTBF 100,000 hours Service Life 5 years Preventive Maintenance None required