W R E N V I F H 9 4 1 9 1 - 7 6 6 D CDC NO MORE PRODUCED Native| Translation ------+-----+-----+----- Form 5.25"/FH Cylinders 1632| | | Capacity form/unform 676/ 766 MB Heads 15| | | Seek time / track 15.5/ 3.0 ms Sector/track 54| | | Controller SCSI1 DIFFERENTIAL Precompensation Cache/Buffer 32 KB LOOK-AHEAD Landing Zone Data transfer rate 1.875 MB/S int Bytes/Sector 512 4.700 MB/S ext SYNC 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 23.0 W Shock g 10 | 32 seek W Rotation RPM 3597 read/write W Acoustic dBA spin-up W ECC Bit 48,INTERNAL MTBF h 150000 Warranty Month 12 Lift/Lock/Park YES Certificates CSA,FCC,IEC380,IEC435,UL47... ********************************************************************** L A Y O U T ********************************************************************** SEAGATE ST4766N (94191-766) PRODUCT MANUAL 77765353-L, DEC. 1991 +------------------------------------------------------++-+J4 | || |Drive | || |Select/ | |+-+Option | +1 |XX | || |XX SCSI | ++ |XX Interface | Resistor +1 |XX J3 | Terminator || |XX | Packs ++ |XX | ++ |XX | || |XX | +1 |XX1 | | | |XX Power | |XX +------------------------------------------------------+ 1 ********************************************************************** J U M P E R S ********************************************************************** SEAGATE ST4766N (94191-766) PRODUCT MANUAL 77765353-L, DEC. 1991 Jumper Setting ============== J4 SCSI ID/Option Select Header -------------------------------- --+-------------------------+-- |o o o o o o o o o| |1 o o o o o o o o| +-------------------------+ TP TP 4 2 1 (2)(3)(6)(7) (4) +------------+----------+ | | 4 2 1 | +------------+----------+ Drive ID is binary coded jumper |SCSI ID = 0 | o o o | position (most significant bit on | | o o o | left), i.e., jumper in position 1 +------------+----------+ would be Drive ID 1, no jumpers means |SCSI ID = 1 | o o x | ID 0. | | o o X | +------------+----------+ |SCSI ID = 2 | o x o | | | o X o | +------------+----------+ |SCSI ID = 3 | o x x | | | o X X | +------------+----------+ |SCSI ID = 4 | x o o | | | X o o | +------------+----------+ |SCSI ID = 5 | x o x | | | X o X | +------------+----------+ |SCSI ID = 6 | x x o | | | X X o | +------------+----------+ |SCSI ID = 7 | x x x | | | X X X | +------------+----------+ (2) CLOSED Enables the Motor Start Option. In this mode of operation the drive will wait for a Start Unit Command from the Host before starting the Motor. OPEN see Note (6) below for description of delayed motor start feature. (3) CLOSED Parity checking by the WREN 6 is enabled. The use of parity is a system option. The WREN 6 SCSI will always generate parity detection. (4) If the unit is not be terminated, remove terminator resistor module SIPs (DIPs). TP Jumper in left vertical position means terminator power (+5V) is from WREN 6 power connector. Jumper in horizontal position means terminator power is taken from interface cable. If the drive is not terminated, the TP jumper need not be installed. (6) Jumper on enables delayed motor start (Motor Start jumper (2) must be off). Motor start up is delayed 16 times drive ID number in seconds; i.e., Drive 0 starts immediately, Drive 1 starts 16 seconds later, Drive 2 starts 16 seconds after Drive 1, etc. (7) Reserved Jumper Position DC Power and pin connector assignments -------------------------------------- --+------------+-- pin 1 +12 VDC | 4 3 2 1 | pin 2 +12 Volts Return +------------+ pin 3 + 5 Volts Return pin 4 + 5 VDC Note: Pins on the drive select and configuration select header are provided to facilitate manual drive configuration. No devices other than jumpers should be connected to these pins. Improper connection to external devices (switches, connectors, etc.) could adversely affect drive performance. Exact location of these pins and headers may change without notice. ********************************************************************** I N S T A L L ********************************************************************** SEAGATE ST4766N (94191-766) PRODUCT MANUAL 77765353-L, DEC. 1991 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 Drive Orientation ----------------- The balanced rotary arm actuator design of the Wren 6 allows it to be mounted in any orientation. All drive performance characterization however, has been done with the drive in horizontal (disc level) and vertical (drive on its side) orientations, and these are the two preferred mounting orientations. WREN 6 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 6 into an OEM's system, wether in a factory or field environment. Mounting Holes -------------- Mounting Holes (6-32 UNC). Four on bottom, two on each side. Max. screw length into chassis is 0.14 in. (3.55 mm). 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 PWAs at the rear of the drive. Service Tools ------------- No special tools are required for site installation or recommended site maintenance. The depot repair philiosophy of WREN 6 precludes the necessity for special tools. If field repair of items external to the HDA is desired, a 6 point Torx T10 driver is required. This may be purchased through most commercial tool catalogs. Physical Description -------------------- Model 94191 WREN 6 may be daisychained together or with other compatible SCSI devices using a common cable. Both ends of the cable must be terminated. The WREN 6 implements single ended or differential drivers and receivers. Drives having single ended interface drivers and receivers allow a maximum cable length of six metres (primarily for connection within a cabinet). The Model 94191-766D WREN 6 implements differential drivers and receivers which allow a maximum cable length of 25 metres. All signals are common between all SCSI devices. The Model 94191 WREN 6 may be daisychained only with SCSI devices having the same type drivers and receivers. Devices having single ended interface circuits cannot be on the same daisychain with devices having differential interface circuits. A maximum of 8 SCSI devices (including the Host) may be daisychained together. The SCSI Devices at both ends of the daisychain are to terminated. Intermediate SCSI devices shall not be terminated. Remove the terminator resistor packs, not the terminator power source selector jumper. Cable Requirements ------------------ Only nonshielded cable connectors are applicable. A 50 conductor flat cable or 25 twisted pair cable shall be used. The maximum total cable length shall be 6.0 metres for single ended drivers and receivers, and 25.0 metres for differential drivers and receivers. A stub length of no more than 0.1 metre for single ended or 2.0 metre for differential circuits is allowed off the mainline interconnection within any connected equipment. For single ended drivers and receivers, an ideal impedance match with cable terminators implies a cable characteristic impedance of 132 ohm single ended option and 122 ohms for the differential option. In general, cables having characteristics impedance of those values are not available; however, impedances that are somewhat lower are satisfactory. A characteristic impedance of 100 ohm 10% is recommended for unshielded flat or twisted pair ribbon cable. However, most available cables have a somewhat lower characteristic impedance. To minimize discontinuities and signal reflections, cables of different impedances should not be used in the same bus. Implementations may require trade-offs in shielding effectiveness, cable length, the number of loads, transfer rates, and cost to achieve satisfactory system operation. If shielded and unshielded cables are mixed within the same SCSI bus, the effect of impedance mismatch must be carefully considered. A minimum conductor size of 28 AWG should be used to minimize noise effects. Suggested nonshielded flat cable part numbers are: Flat cable 3M-3365-50 Twisted pair Spectra twist in flat 455-248-50 Equivalent parts may be used. Connector Requirements ---------------------- The nonshielded cable connector shall be a 50 conductor connector constisting of to rows of 25 female contacts with adjacent contacts 100 mils apart. Recommended Mating Flat Cable Connector Part Numbers are: Closed end 3M-3425-7000 W/O Strain Relief, No Center Key (for cable 3M-3425-7050 With Strain Relief, No Center Key ends) Dupont-66900-290 With Strain Relief, With Center Key Open end 3M-3425-6000 W/O Strain Relief, No Center Key (In Daisy- 3M-3425-6050 With Strain Relief, No Center Key chain) Dupont-66900-250 With Strain Relief, With Center Key The Model 94191 WREN 6 device connector is a nonshielded 50 conductor connector consisting of two row of 25 male pins with adjacent pins 100 mils apart. The connector is keyed. Drive Connector Part Number: Berg - 65496 - 031 or equivalent. Single Ended ------------ All odd pins except pin 25 are connected to ground. Pin 25 is left open. CAUTION Pin 25 must not be connected to ground at the HOST end or the drive end of the cable. If the I/O connector should accidentally be plugged in upside down, terminator power on Pin 26 will shorted to ground. +--------------SCSI-DEVICE-----------------+ | +--+ HOST ADAPTER/INITIATOR *** | | |T | | +-------++-+-------------------------------+ *| | | 1 thru 8 SCSI devices +--------- -----+--------------+ **| **| |* +--------+---+ +---------+--+ +--------++-++ |WREN | |WREN | |WREN | T|| |or other | |or other | |or other+--+| |SCSI device | |SCSI device | |SCSI device | +------------+ +------------+ +------------+ * Closed end type connector used ** Open type (in-line application) Connector used. *** Host need not be on the end of the daisy chain. Another device can be on the end with the terminator, the host having no terminator. T indicates termination required. DC Cable and Connector ---------------------- The WREN 6 receives DC power through a 4 pin right angle connector mounted on the servo PWA. Recommended part numbers of the mating connector are listed below, but equivalent parts may be used. Type of cable: 14 AWG Connector: AMP 1-480424-0 Contacts: AMP 60619-4 (Loose Piece); AMP 61117-4 (Strip) Electrical Description ---------------------- The Model 94191-766 WREN 6 uses single ended interface signals and these signals must be terminated with 220 ohm to +5 V and 330 ohm to ground at each end of the total cable. All signals use open collector or three state drivers. Optional termination is available internal to the WREN 6. The Model 94191-766D uses differential interface signals and each of these must be terminated at each end of the total cable with 330 ohms to +5 V and 330 ohms to ground with 150 ohms between each differential pair. All signals use open collector, three state drivers. Drives are shipped with or without terminators, depending on option. Single Ended Drivers/Receivers ------------------------------ Single ended drivers and receivers are used by the WREN 6. Transmitter Characteristics --------------------------- The WREN 6 uses an ANSI SCSI compatible open collector single ended driver. This driver is capable of sinking a current of 48 mA with a low level output voltage of 0.4 volt. Receiver Characteristics ------------------------ The WREN 6 uses a ANSI SCSI single ended receiver with hysteresis gate or equivalent as a line receiver. Differential Drivers/Receivers ------------------------------ Differential drivers and receivers are used by the Model 94191-766D WREN 6. Differential Signals -------------------- All signals consist of two lines denoted +SIGNAL and -SIGNAL. A signal is true when +SIGNAL is more positive than -SIGNAL, and a signal is false when -SIGNAL is more positive than +SIGNAL. All assigned signals ahall be terminated at each end of the cable. Output Characteristics ---------------------- Each signal driven by the WREN 6 (Differential Interface) shall have the following output characteristics when measured at the WREN 6 SCSI connector: Low-level output voltage* = 2.0V max. at low-level output current = 55 milliamps. High-level output voltage* = 3.0V min. at high-level output current = -55 milliamps. Differential voltage = 1.0V min. with common-mode voltages ranges from -7V dc to +12V dc. *These voltages shall be measured between the output terminal and the SCSI device's logic ground reference. The output characteristics shall aditionally conform to EIA RS-485-1983. Input Characteristics --------------------- Each signal received by the WREN 6 (Differential Interface) shall have the following input characteristics when measured at the WREN 6 SCSI connector: Input current on either input = +2.0 milliamps maximum. NOTE These characteristics include both receivers and passive drivers. This requirement shall be met with the input voltage varying between -7V dc and +12V dc, with power on or off, and with the hysteresis equaling 35 mv, minimum. The input characteristics shall additionally conform to EIA RS-485-1983. Terminator Requirements ----------------------- Internal WREN 6 I/O termination consist of three resistor modules which plug into sockets on the Main PWA. The WREN 6 may be ordered with or without these termination resistors to facilitate a particular application. All single initiator/single target (non- daisychain) applications require that the Initiator and WREN 6 be terminated. Daisychain applications require that only the unit at each end of the daisychain be terminated. All other peripherals on the chain should not be terminated. Note: Remove terminator resistor packs where terminators are not required. Removal of terminator power source selection jumper does not disconnect the terminator resistor from the circuit. SIP's for Single Ended Interface Drivers/Receivers; SIP's and DIP's for Differential Interface Drivers/Receivers Option. Terminator Power ---------------- The WREN 6 does not supply Terminator power for the SCSI bus. The WREN 6 may be configured to accept terminator power via Pin 26 of the SCSI bus or to provide terminator power for optional internal termination resistors via the WREN 6 power connector. SCSI devices providing termination power (TERMPWR) shall have the following characteristics: V TERM = 4.0V to 5.25V 800 mA min source drive capability 1.0 A maximum ********************************************************************** F E A T U R E S ********************************************************************** SEAGATE ST4766N (94191-766) PRODUCT MANUAL 77765353-L, DEC. 1991 General Description ------------------- The WREN 6 is a member of a family of low cost, high performance, highly reliable, random access storage devices designed to meet the needs of the OEM marketplace. 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 is a UL Recognized component per UL 478 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 and EN 60950/1.1.88, DIN IEC 435/VDE 0805/11.84 and EN 60950/09.87. 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 Subpart J of Part 15 of the FCC Rules and Regulations nor the Radio Interference Regulations of the Canadian Department of Communications. The Head, Disc and Actuator Assembly chamber (HDA) is environmentally sealed at the factory. Air is recirculated within the HDA through a nonreplaceable filter to maintain a contamination free disc/actuator environment. The WREN 6 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 6 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 6 decodes Track 0 location from the dedicated servo surface thereby eliminating mechanical transducer adjustments and related reliability concerns. The WREN 6 uses a high performance actuator assembly consisting of a low inertia, balanced, patented, straight arm design which provides excellent performance with minimum power dissipation. Media Description ----------------- The media used on the WREN 6 has a diameter of approximately 5 inches (130 mm). The aluminum substrate is coated with a thin film magnetic material, overcoated with a proprietary protective layer for improved durability and environmental protection. Defect and Error Management --------------------------- 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 by the host (initiator). Defect and error management in the SCSI system involves WREN 6 internal defect/error management and SCSI systems error considera- tions (errors in communications between Initiator and WREN 6). Tools for use in designing a defect/error management plan are briefly outlined in this section, with references to other sections where further details are given. WREN 6 Internal Defects/Errors ------------------------------ Identified defects are recorded on the WREN 6 defects list tracks (referred to as the primary or ETF defect list). It is recommended that these known defects be reallocated during the initial WREN 6 format operation. The WREN 6 internal retries and data correction by ECC should be enabled to recover data from additional flaws if they occur. If data correction by ECC is required to recover data, the host should immediately reallocate this sector by use of the Reassign Blocks command. If the WREN 6 automatic retries and data correction by ECC features are not used, defects are usually un- recoverable and need to be reallocated as they are diacovered. For reallocation of bad sectors, the number of spare sectors per track or cylinder and the number of spare tracks per volume is programmable. After formatting, defects can be automatically reallocated by the WREN 6, or can be reallocated when the host sends the Reassign Blocks Command. Seek Time --------- | 94191 | ----------------------------------+---------+ Track-to-Track msec. typ. | 3 | msec. max. | 4 | Average msec. typ. | 15.5 | Average msec. max. | 17.5 | Full Stroke msec. typ. | 35 | msec. max. | 40 | Latency msec. avg. | 8.33 | ----------------------------------+---------+ Seek times does not include drive controller overhead. Read Look-Ahead/Cache Control ----------------------------- The WREN 6 Model 94191 provides a Read Look-ahead buffering algorithm which can in may cases enhance system performance. This feature may be selected by issuing a Mode Select Command with the Enable/Disable Cache bit set in the Cache Control page. Power Sequencing ---------------- Power sequencing is not required for the WREN 6. The WREN 6 protects against inadvertent writing during power up and down. Daisychain operation requires that power be maintained on the terminated WREN 6 to ensure proper termination of the peripheral I/O cables. Start/Stop Time --------------- After DC power has been applied, the WREN 6 will become ready within 39 seconds if the Motor Start Option is disabled. During this time, the drive will respond to the SCSI interface. Stop time will be less than 30 seconds from removal of DC power. If the Motor Start Option is enabled, the internal controller will accept a Motor Start, Inquiry or Request Sense Command via the SCSI interface 3 seconds after DC power has been applied. After the Motor Start Command has been received the WREN 6 will become ready for normal operations within 36 seconds. During this time the drive will respond to the SCSI interface in accorance with the rules for Command Queing. There is no power control switch on the drive. Temperature ----------- The drive will meet all specifications over a 50*F to 122*F (10*C to 50*C) ambient temperature range with a maximum gradient of 36*F (20*C) per hour. The enclosure for the drive should be designed such that the temperatures at the locations are not exceeded. Air flow may be needed to achieve these temperature values. Air Cleanliness --------------- The WREN 6 is designed to operate in a typical office environment with minimal environmental control. Reliability ----------- The following reliability specifications assume correct host/drive operational interface, including all interface timings, power supply voltages, and environmental requirements. MTBF 150,000 hours Service Life 5 years Preventive Maintenance None required Sectors per track ----------------- 54 @ 512 bytes per sector 28 @ 1024 bytes per sector Formatted Capacity ------------------ Formatted capacity achieved depends on the number of spare reallocation sectors reserved and the number of bytes per sector. The following table shows some typical formatted capacities achievable. +--------------------------+-----------------------------------+ |Spare Sectors or Cylinders| Sector Size* | |Reserved for reallocation |512 Bytes/Sector| 1024 Bytes/Sector| +--------------------------+----------------+------------------+ |No Spares | 676 MB | 701 MB | +--------------------------+----------------+------------------+ |One Spare Sector per track| | | |and two spare Cyl/Unit** | 663 MB | 675 MB | +--------------------------+----------------+------------------+ |Two Spare Cylinders/Unit**| 675 MB | 701 MB | +--------------------------+----------------+------------------+ The standard OEM Model is as follows: Formatted Data Block Size* Unformatted Model 94191-766 (15 Heads) 1024 Byte 512 Byte 675 MB 663 MB 766 MB * User selectable at format time. The user may modify the data block size before issuing a format command and obtain different formatted capacities than those listed. User available capacity will depend on spare reallocation scheme selected. ** Spare cylinders are on the inner tracks Heat/Power Dissipation ---------------------- Each single ended interface WREN 6 will dissipate no more than 27 watts (92 BTUs per hour) of DC power average under worst case operat- ing conditions. Typical power dissipation under idle operating con- ditions is less than 21 watts. WREN 5 drives having the differential interface circuits will dissipate no more than 30 watts (102.2 BTU's per hour) of DC power average under worst case operating conditions. Typical power dissipation under idle operating conditions is less than 23.1 watts. Electromagnetic Susceptibility ------------------------------ As a component assembly, the WREN 6 is not required to meet any susceptibility performance requirements. It is the responsibility of the system integrator to perform those tests required to assure that equipment operating in the same system as the WREN 6 does not adversely affect the performance of the WREN 6. Logical Unit Number (LUN) ------------------------- The logical unit number (LUN) addresses one of up to eight physical devices or virtual devices attached to a target. The only valid LUN number for WREN 6 is Zero. The LUN in the CDB is provided for systems that do not implement the Identify Message. If an Identify message is sent to the WREN 6, the WREN 6 will use the LUN number specified in this message. In this case, the WREN 6 shall ignore the LUN specified within the command descriptor block. The WREN 6 will reject commands which select an invalid LUN (except Request Sense and Inquiry) by requesting and accepting the command bytes, then going to Status phase and sending Check Condition status. Note that the LUN is sent in the LUN field of a CDB (if no Identify message has been received for this selection) or by the LUN field of an Identify message. Request Sense commands selecting an invalid LUN will receive a Sense Data block with the Illegal Request Sense Key and an Invalid LUN Error Code. Inquiry commands will return Inquiry Data with the Peripheral Device Type field set to Logical Unit Not Present (7FH). Request Sense and Inquiry commands will not send Check Condition status in response to an invalid LUN selection.