Seagate ST34572N Product Manual
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Seagate ST34572N Product Manual

Seagate ST34572N Product Manual

4xl family
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Enlarged version
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Barracuda 4XL Family:
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ST34572N/W/WD/WC/DC
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ST32272N/W/WD/WC/DC
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Product Manual, Volume 1
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Summary of Contents for Seagate ST34572N

  • Page 1 ..........ST34572N/W/WD/WC/DC .
  • Page 3 ..........ST34572N/W/WD/WC/DC .
  • Page 4 Seagate reserves the right to change, without notice, product offerings or specifications. No part of this publication may be reproduced in any form without written permission of Seagate Technol- ogy, Inc.
  • Page 5 Revision status summary sheet Revision Date Writer/Engineer Sheets Affected A Issue 03/26/97 L. Newman/A. Ukani 1/1, v thru viii, 1 thru 82. 11/04/97 L. Newman/A. Ukani 8, 9, 10, 28, 29, 30, 47, 49, 50, and 72. Notice. This manual is volume 1 of a two-volume document with the SCSI interface information in the Volume 2 SCSI Interface Product Manual , part number 77738479.

  • Page 7: Table Of Contents

    Barracuda 4XL Product Manual, Rev. B Contents Scope ................1 Applicable standards and reference documentation.
  • Page 8 Seagate technical support services ........
  • Page 9 Barracuda 4XL Product Manual, Rev. B Figures Figure 1. Barracuda 4XL family drive ........... 1 Figure 2.

  • Page 11: Scope

    Barracuda 4XL Product Manual, Rev. B Scope This manual describes the Seagate Technology®, Inc. Barracuda 4XL™ disc drives. Barracuda 4XL drives support the small computer system interface (SCSI) as described in the ANSI SCSI, SCSI-2, and SCSI-3 (Fast-20) interface specifications to the extent described in this manual. The SCSI Inter- face Product Manual (part number 77738479) describes general SCSI interface characteristics of this and other families of Seagate drives.

  • Page 13: Applicable Standards And Reference Documentation

    Mounting by bottom holes must meet the requirements of Section 8.4. Standards Barracuda 4XL family drives comply with Seagate standards as noted in the appropriate sections of this man- ual and the Seagate SCSI Interface Product Manual , part number 77738479 (Vol. 2).

  • Page 14: Reference Documents

    (X3T9.2/82-2 Rev. 17B), X3T9.2/86-109 Revision 10H (SCSI-2), X3T9.2/91/010 Rev. 10 (SCSI-3) parallel inter- face, X3T9.2-184 Rev. 4 (SCSI-3) and ANSI SCSI-3 Fast-20, X3T10/1071D. Package Test Specification Seagate P/N 30190-001 (under 100 lb.) Package Test Specification Seagate P/N 30191-001 (over 100 lb.)

  • Page 15: General Description

    (volume 1), which defines the product performance char- acteristics of the Barracuda 4XL family of drives, and the SCSI Interface Product Manual (volume 2), part num- ber 77738479, which describes the general interface characteristics of this and other families of Seagate SCSI drives.

  • Page 16: Figure 2. Barracuda 4Xl Family Drive

    Barracuda 4XL Product Manual, Rev. B Barracuda 4XL drives decode track 0 location data from the servo data embedded on each surface to eliminate mechanical transducer adjustments and related reliability concerns. A high-performance actuator assembly with a low-inertia, balanced, patented, straight-arm design provides excellent performance with minimal power dissipation.

  • Page 17: Standard Features

    Barracuda 4XL Product Manual, Rev. B Standard features The Barracuda 4XL family has the following standard features: • Integrated SCSI controller • Single-ended and differential SCSI drivers and receivers • 8 bit and 16 bit I/O data bus models available •...

  • Page 18: Unformatted And Formatted Capacities

    Barracuda 4XL Product Manual, Rev. B Unformatted and formatted capacities Formatted capacity depends on the number of spare reallocation sectors reserved and the number of bytes per sector. The following table shows the standard OEM model read capacity data. Total LBAs = read capacity data shown below + 1.

  • Page 19: Performance Characteristics

    Barracuda 4XL Product Manual, Rev. B Performance characteristics Internal drive characteristics (transparent to user) ST34572 ST32272 Drive Capacity 3.25 GByte (unformatted) Read/Write Heads Bytes/Track 124,000 124,000 Bytes (average, unformatted) Bytes/Surface 812.5 812.5 Mbytes (unformatted) Tracks/Surface, Total 6,311 6,311 Tracks (user accessible) Tracks/Inch 6,800 6,800...

  • Page 20: Format Command Execution Time (Minutes)

    Barracuda 4XL Product Manual, Rev. B 4.2.2 Format command execution time (minutes) [1]* ST34572 ST32272 Maximum (with verify) Maximum (no verify) 4.2.3 Generalized performance characteristics Minimum sector interleave 1 to 1 Data buffer transfer rate to/from disc media (one 512-byte sector): Min.

  • Page 21: Start/Stop Time

    Barracuda 4XL Product Manual, Rev. B Notes for Section 4.2. Execution time is measured from receipt of the last Byte of the Command Descriptor Block (CDB) to the request for a Status Byte Transfer to the Initiator (excluding connect/disconnect). Maximum times are specified over the worst case conditions of temperature, voltage margins and drive orientation.

  • Page 22: Caching Write Data

    Barracuda 4XL Product Manual, Rev. B “miss”, all data transfers to the host are in accordance with “buffer-full” ratio rules. On a cache “hit” the drive ignores the “buffer-full” ratio rules. See explanations associated with Mode page 02h (disconnect/reconnect control) in the SCSI Interface Product Manual (part number 77738479). The following is a simplified description of a read operation with cache operation enabled: Case A - A Read command is received and the first logical block (LB) is already in cache: 1.
  • Page 23 Barracuda 4XL Product Manual, Rev. B system performance. The max prefetch field (bytes 8 and 9) limits the amount of prefetch. The drive does not use the prefetch “ceiling” field (bytes 10 and 11). During a prefetch operation, the drive crosses a cylinder boundary to fetch more data only if the Discontinuity (DISC) bit is set to one in bit 4 of byte 2 of Mode parameters page 08h.

  • Page 25: Reliability Specifications

    Barracuda 4XL Product Manual, Rev. B Reliability specifications The following reliability specifications assume correct host/drive operational interface, including all interface timings, power supply voltages, environmental requirements and drive mounting constraints (see Section 8.4). Seek Errors Less than 1 in 10 seeks Read Error Rates [1] Recovered Data...

  • Page 26: Seek Errors

    Barracuda 4XL Product Manual, Rev. B 5.1.4 Seek errors A seek error is defined as a failure of the drive to position the heads to the addressed track. There shall be no more than ten recoverable seek errors in 10 physical seek operations.

  • Page 27: Hot Plugging Barracuda 4Xl Disc Drives

    Barracuda 4XL Product Manual, Rev. B 5.2.6 Hot plugging Barracuda 4XL disc drives Caution: Hot-plug drives are not designed for simultaneous power disconnection and physical removal. During power-up and power-down periods, the hot SCSI connect/disconnect capability does not produce glitches or any corruptions on an active SCSI bus. Barracuda 4XL drives conform to the SCSI-3 standard requirements for glitch-free power-on and power-off.

  • Page 28: Product Warranty

    Seagate’s option and at no charge to customer, if returned by customer at cus- tomer’s expense to Seagate’s designated facility in accordance with Seagate’s Warranty Procedure. Seagate will pay for transporting the repair or replacement item to customer.
  • Page 29 Barracuda 4XL Product Manual, Rev. B Shipping When transporting or shipping a drive, a Seagate approved container must be used. Keep your original box. They are easily identified by the Seagate Approved Package label. Shipping a drive in a non-approved con- tainer voids the drive warranty.

  • Page 31: Physical/Electrical Specifications

    Barracuda 4XL Product Manual, Rev. B Physical/electrical specifications This section provides information relating to the physical and electrical characteristics of Barracuda 4XL drives. AC power requirements None. DC power requirements The voltage and current requirements for a single drive are shown in the following table. Values indicated apply at the drive power connector.

  • Page 32: Conducted Noise Immunity

    Barracuda 4XL Product Manual, Rev. B 6.2.1 Conducted noise immunity Noise is specified as a periodic and random distribution of frequencies covering a band from DC to 10 mHz. Maximum allowed noise values given below are peak to peak measurements and apply at the drive power con- nector.

  • Page 33: Power Dissipation

    Barracuda 4XL Product Manual, Rev. B Power dissipation ST34572N/W/WC and ST32272N/W/WC For drives with single ended interface circuits, typical operating random read power dissipation is 12.9 watts (44 BTUs per hour) of DC power average at nominal voltages. Typical power dissipation under idle conditions is 8.8 watts (30 BTUs per hour).

  • Page 34: Figure 4. Locations Of Printed Circuit Board (Pcb) Components Listed In Table 3

    Non-operating –40° to 158°F (–40° to 70°C) package ambient with a maximum gradient of 45°F (25°C) per hour. This specification assumes that the drive is packaged in the shipping container designed by Seagate for use with drive. Model “WC/DC” PCB PCB 3 Model “W/WD”...

  • Page 35: Relative Humidity

    Disc drives shipped as loose load (not palletized) general freight will be packaged to withstand drops from heights as defined in the table below. For additional details refer to Seagate specifications 30190-001 (under 100 lbs/45 kg) or 30191-001 (over 100 lbs/45 Kg).

  • Page 36: Figure 5. Recommended Mounting

    Barracuda 4XL Product Manual, Rev. B Package size Packaged/product weight Drop height 600-1800 cu in (9,800-19,700 cu cm) 0-20 lb (0 to 9.1 kg) 48 in (1219 mm) >1800 cu in (>19,700 cu cm) 0-20 lb (0 to 9.1 kg) 42 in (1067 mm) >600 cu in (>9,800 cu cm) 20-40 lb (9.1 to 18.1 kg)

  • Page 37: Vibration

    Air cleanliness The drive is designed to operate in a typical office environment with minimal environmental control. 6.4.6 Acoustics Sound power during idle mode shall be 4.2 bels typical when measured to Seagate’s 30553-001 specification. 6.4.7 Electromagnetic susceptibility See Section 2.1.2.

  • Page 38: Mechanical Specifications

    Barracuda 4XL Product Manual, Rev. B Mechanical specifications The following nominal dimensions are exclusive of the decorative front panel accessory. However, dimensions of the front panel are shown in figure below. Refer to Figures 6, 7, and 8 for detailed mounting configuration dimensions.

  • Page 39: Figure 7. Mounting Configuration Dimensions For Models "W" And "Wd

    Barracuda 4XL Product Manual, Rev. B A [3] Notes: Mounting holes three on each side, 6-32 UNC. Max screw length into side of drive 0.15 in. (3.81 mm). Screw tightening torque 6.0 in-lb (.675 NM) max with minimum thread engagement of 0.12 in.

  • Page 40: Figure 8. Mounting Configuration Dimensions For Models "Wc" And "Dc

    Barracuda 4XL Product Manual, Rev. B A [3] Notes: Mounting holes three on each side, 6-32 UNC. Max screw length into side of drive 0.15 in. (3.81 mm). Screw tightening torque 6.0 in-lb (.675 NM) max with minimum thread engagement of 0.12 in. (3.05 mm).

  • Page 41: Defect And Error Management

    Barracuda 4XL Product Manual, Rev. B Defect and error management The drive, 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 the drive internal defect/error management and SCSI systems error considerations (errors in communications between Initiator and the drive).

  • Page 43: Installation

    J2, J1-Auxiliary and J6. Suggested part number for the jumpers used on J2 is Molex 52747-0211(Seagate P/N 77679052). Suggested part number for the jumpers used on J1-Auxiliary and J6 are Method Electronics 861M- 202-70 (Seagate part number 15481851). A bag with the two jumper plug types is shipped with standard OEM drives.

  • Page 44: Figure 9. Barracuda 4Xl Family Drive Id Select Header For Models "N

    Barracuda 4XL Product Manual, Rev. B Drive Front Jumper Plug (enlarged to show detail) Pin 1 Reserved A 2 A 1 A 0 SCSI ID = 0 (default) SCSI ID = 1 SCSI ID = 2 SCSI ID = 3 SCSI ID = 4 SCSI ID = 5 SCSI ID = 6...

  • Page 45: Figure 10. Barracuda 4Xl Family Drive Id Select For Models "W," "Wc," "Wd," And "Dc

    Barracuda 4XL Product Manual, Rev. B Drive Front Jumper Plug (enlarged to show detail) Pin 1 Reserved A 2 A 1 A 0 SCSI ID = 0 (default) SCSI ID = 1 SCSI ID = 2 SCSI ID = 3 SCSI ID = 4 SCSI ID = 5 SCSI ID = 6...

  • Page 46: Figure 11. Barracuda 4Xl Family Drive Id Select Header J1-Auxiliary For Models "W" And "Wd" (J1-Auxiliary Pins 1A - 12A)

    Barracuda 4XL Product Manual, Rev. B Drive HDA (rear view, PCB facing downward) J1-Auxiliary [1] [2] Pin 1 +5V Ground Pin 1A J1-DC Power Pin 12A 68 Pin SCSI ID = 0 (default) SCSI I/O Connector SCSI ID = 1 SCSI ID = 2 SCSI ID = 3 SCSI ID = 4...

  • Page 47: Figure 12. Barracuda 4Xl Family Drive Option Select Header For Models "N," "W," And "Wd

    Barracuda 4XL Product Manual, Rev. B Pin 1 Jumper Caution: Positions (default - models Terminator Enable Do not use J2 jumper “N” and “W” only) plugs on J6 or J1- Delay Motor Start Auxiliary, as the internal Enable Motor Start contacts will be deformed and can not be used on Write Protect...

  • Page 48: Notes For Figures 9, 10, 11, 12, And 13

    Barracuda 4XL Product Manual, Rev. B 8.1.1 Notes for Figures 9, 10, 11, 12, and 13. Notes explaining the functions of the various jumpers on jumper header connectors J2, J1-Auxiliary and J6 are given here and in Section 8.1.2. The term “default” means as standard OEM units are configured with a jumper on those positions when shipped from factory.
  • Page 49 Barracuda 4XL Product Manual, Rev. B The host can drive a remotely located Drive Activity LED using signal. Use either J1 or J6, but not both. The drive reads the ID (asserted low) from J1-Auxiliary pins 1, 3, 5 and 7 for 250 ms after power-on or drive reset.

  • Page 50: Function Description

    Barracuda 4XL Product Manual, Rev. B 8.1.2 Function description Jumper Installation Jumper Function Description (Applies only to “N” and “W” models) With the jumper installed, the On-board (non-removable) terminator circuits are enabled (connected to the I/O lines). Default is jumper installed. Terminator circuits not enabled (not connected to I/O lines).

  • Page 51: Drive Orientation

    Barracuda 4XL Product Manual, Rev. B Drive orientation The balanced rotary arm actuator design of the drive allows it to be mounted in any orientation. All drive perfor- mance characterization, however, has been done with the drive in horizontal (discs level) and vertical (drive on its side) orientations, and these are the two preferred mounting orientations.

  • Page 52: Drive Mounting

    Note. Before mounting the drive in any kind of 3.5-inch to 5.25-inch adapter frame, verify with Seagate Tech- nology that the drive can meet the shock and vibration specifications given herein while mounted in such an adapter frame.

  • Page 53: Interface Requirements

    Barracuda 4XL Product Manual, Rev. B Interface requirements This section describes Barracuda 4XL interface requirements. General description This section partially describes the interface requirements as implemented on the drives. The major portion of the interface requirements /implementation is described in the SCSI Interface Product Manual (part num- ber 77738479).

  • Page 54: Scsi Interface Commands Supported

    Barracuda 4XL Product Manual, Rev. B SCSI interface commands supported Table 6 following lists the SCSI interface commands that are supported in the SCSI-2, and SCSI-3 modes of the drive. Barracuda 4XL family drives can be changed back and forth between SCSI-1 and SCSI-2/SCSI-3 modes using the Change Definition command.
  • Page 55 Barracuda 4XL Product Manual, Rev. B Table 6: Commands supported by Barracuda 4XL family drive (Continued) Command Supported by Command name code SCSI-2/3 Mode sense Y [2] Caching parameters page (08h) Control mode page (0Ah) Disconnect/reconnect (02h) (DTDC, DIMM not used) Error recovery page (01h) Format page (03h) Information exceptions control page (1Ch)
  • Page 56 Barracuda 4XL Product Manual, Rev. B Table 6: Commands supported by Barracuda 4XL family drive (Continued) Command Supported by Command name code SCSI-2/3 Seek extended Send diagnostics Supported diagnostics pages (00h) Translate page (40h) Set limits Start unit/stop unit (spindle ceases rotating) (1CH) Synchronize cache Test unit ready Verify...

  • Page 57: Inquiry Vital Product Data

    Barracuda 4XL Product Manual, Rev. B Table 7 lists the Standard Inquiry command data that the drive should return to the initiator per the format given in the SCSI Interface Manual (part number 77738479), section 5.1.1.3. Table 7: Barracuda 4XL family drive Standard Inquiry data Bytes Data (HEX) 0-15...

  • Page 58: Mode Sense Data

    Barracuda 4XL Product Manual, Rev. B 9.3.2 Mode Sense data The Mode Sense command provides a means for the drive to report its operating parameters to the initiator. The drive maintains four sets of Mode parameters, Default values, Saved values, Current values and Change- able values.
  • Page 59 Barracuda 4XL Product Manual, Rev. B The following tables list the values of the data bytes returned by the drive in response to the Mode Sense com- mand pages for SCSI-2/SCSI-3 implementation. See the SCSI Interface Product Manual . Definitions: = Saved value = Default value.
  • Page 60 Barracuda 4XL Product Manual, Rev. B Table 9: Mode sense data, ST32272 default values (SCSI-2/3 implementation) Bytes 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Mode 97 00 10 08 Sense...

  • Page 61: Scsi Bus Conditions And Miscellaneous Features Supported

    Barracuda 4XL Product Manual, Rev. B SCSI bus conditions and miscellaneous features supported Asynchronous SCSI bus conditions supported by the drive are listed below. These conditions cause the SCSI device to perform certain actions and can alter the SCSI bus phase sequence. Other miscellaneous operating features supported are also listed here.

  • Page 62: Synchronous Data Transfer

    Details of the physical, electrical and logical characteristics are given in sections following, while the SCSI operational aspects of Seagate drive interfaces are given in the Seagate SCSI Interface Product Manual , part number 77738479. This section describes the connectors, cables, signals, terminators and bus timing of the DC and SCSI I/O interface.

  • Page 63: Figure 15. Physical Interface For "N" Model Drives

    Barracuda 4XL Product Manual, Rev. B Power +12V +12V ret + 5V ret + 5V 3P 2P DC Power Pin 1 Connector Pin 1 SCSI I/O Connector Figure 15. Physical interface for “N” model drives...

  • Page 64: Figure 16. Physical Interface For "W" And "Wd" Model Drives

    Barracuda 4XL Product Manual, Rev. B Power +12V +12V ret + 5V ret + 5V J1-Auxiliary Pin 1 Pin 1A J1-DC Power J1-DC Power J1-Auxiliary Pin 1P Pin 1A Pin 1 68 Pin SCSI I/O Connector Figure 16. Physical interface for “W” and “WD” model drives 80 Pin SCSI I/O and Power Connector...

  • Page 65: Scsi Interface Physical Description

    Barracuda 4XL Product Manual, Rev. B 9.6.2 SCSI interface physical description The drives may be daisy-chained together or with other compatible SCSI devices. Both ends of the cable must be terminated. The “N,” “W,” and “WC” model drives implement single-ended drivers and receivers. All signals are common between all SCSI devices.

  • Page 66: Single-Ended I/O Circuits ("N" And "W" Models)

    Barracuda 4XL Product Manual, Rev. B 9.6.3.1 Single-ended I/O circuits (“N” and “W” models) The maximum total cable length allowed with drives having single-ended I/O driver and receiver circuits depends on several factors. Table 12 lists the maximum lengths allowed for different configurations of drive usage.

  • Page 67: Mating Connectors For "N" Models

    Barracuda 4XL Product Manual, Rev. B 9.6.4.1 Mating connectors for “N” models The nonshielded cable connector shall be a 50 conductor connector consisting of two rows of 25 female con- tacts with adjacent contacts 0.1 inches (2.54 mm) apart. Recommended mating flat cable connector part numbers are: Closed end 3M-3425-7000 W/O Strain Relief, No Center Key...

  • Page 68: Figure 18. Scsi Daisy-Chain Interface Cabling For "N," "W," And "Wd" Model Drives

    Barracuda 4XL Product Manual, Rev. B Recommended mating 80-position PCB mount connectors: Straight-in connector Hot Plug version (with ground guide-pin) Seagate P/N: 77678703 Amp US P/N: 2-557103-1 787311-1 with polarization 94-0680-02-1 Amp US P/N: 2-557103-2 787311-2 without polarization 94-0680-02-2 Amp Japan P/N:...

  • Page 69: Figure 19. Nonshielded 50 Pin Scsi Device Connector Used On "N" Model Drives

    Barracuda 4XL Product Manual, Rev. B .370 ± .010 (9.398) Ref. (15.24) (10.67) Typ. (5.08) .065 x 45° Chamfer Typ. (1.65) Pin 49 Pin 1 .037 Ref. Typ. Typ. (.94) (6.60) .335 ± .010 (8.50) .100 (2.54) .025 +.001 Sq. Contact –.002 Dia.

  • Page 70: Figure 20. Non-Shielded 68 Pin Scsi Device Connector Used On "W" And "Wd" Model Drives

    Barracuda 4XL Product Manual, Rev. B 3.650±.005 .346 .270 . 1 55 1.650 .3937 .600 .050 .0787 .200 .022 .020 .047 (15.24) .519 (13.18) (5.08) .100 Pos. 1.816 .315 .085 (2.54) (46.13) Pos. Position 1 x 45° chamfer (8.00) (2.16) .315 ±...

  • Page 71: Figure 21. Non-Shielded 80 Pin Scsi "Sca-2" Connector, Used On "Wc" And "Dc" Model Drives

    Barracuda 4XL Product Manual, Rev. B 7.00 (.276) 12.70 End View (.500) Grounding Pins 57.87 ± 0.20 (2.278 ± 0.008) 51.17 ± 0.10 (2.251 ± 0.004) 0.15 M Y M (.006) C L of Datum Y –Y– Front View Pin 1 ±...
  • Page 72 Barracuda 4XL Product Manual, Rev. B Table 13: Model “N,” single ended I/O, 50 conductor, signal/contact assignments Note. The minus sign next to the signal indicates asserted state is the low voltage of the two levels used for logic signals. Connector Cable Connector...
  • Page 73 Barracuda 4XL Product Manual, Rev. B Table 14: “W” models single ended I/O cable 68 conductor signal/contact assignments Note. The minus sign next to the signal indicates asserted state is the low voltage of the two levels used for logic signals Connector Cable Connector...
  • Page 74 Barracuda 4XL Product Manual, Rev. B Table 15: “WD” models differential cable 68 conductor signal/pin assignments (Nonshielded connector)[13] Note. The minus sign next to the signal indicates asserted state is the low voltage of the two levels used for logic signals. Connector Cable Connector...
  • Page 75 Barracuda 4XL Product Manual, Rev. B Table 16: “WC” models single ended I/O, 80 conductor cable signal/contact assignments Note. The minus sign next to the signal indicates asserted state is the low voltage of the two levels used for logic signals Connector Signal contact...
  • Page 76 Barracuda 4XL Product Manual, Rev. B Table 17: “DC” differential models, 80 pin I/O connector pin assignments (Non-shielded connector) [13] Note. The minus sign next to the signal indicates asserted state is the low voltage of the two levels used for logic signals Connector Signal...
  • Page 77 Barracuda 4XL Product Manual, Rev. B Notes [ ] for Tables 13 through 17. See Section 9.7.1 or 9.6.4.2 for detailed electrical characteristics of these signals. The conductor number refers to the conductor position when using 0.025-inches (0.635 mm) centerline flat ribbon cable.

  • Page 78: Electrical Description

    Barracuda 4XL Product Manual, Rev. B Electrical description “N” and “W” models use single-ended interface signals. These signals must be terminated with 110-ohm active termination circuits at each end of the total cable. Single-ended circuits use open collector or three state driv- ers.

  • Page 79: Differential Drivers/Receivers

    Barracuda 4XL Product Manual, Rev. B 9.7.2 Differential drivers/receivers Differential drivers and receivers are used by the “WD,” and “DC” models. Typical circuits are shown in Figure 23. The drive has no provisions for terminator circuits on differential I/O drives. Differential signals All differential interface signals consist of two lines denoted +SIGNAL and –SIGNAL.

  • Page 80: Figure 23. Typical Differential I/O Line Transmitter/Receiver And External Terminators

    See Section 9.7.2 for signal characteristics. I/O Line terminators. If SCSI device is a Seagate disc drive, terminators and a place to plug them in must be provided external to the drive by user, systems integrator or host equipment manufacturer where needed.

  • Page 81: Terminator Requirements

    Barracuda 4XL Product Manual, Rev. B Terminator requirements Internal disc drive I/O termination (provided only in model “N” and “W” drives single ended I/O model drives) consists of active circuits in an LSI module that is permanently mounted on the PCB. All single initiator/single target (non-daisy-chain) applications require that the Initiator and disc drive be terminated.

  • Page 82: Disc Drive Scsi Timing

    Barracuda 4XL Product Manual, Rev. B 9.10 Disc drive SCSI timing Table 18: Disc drive SCSI timing Waveform Waveform Description symbol [1] table [1] Typical timing <2 µs Target Select Time (no Arbitration) [4] <2 µs Target Select Time (with Arbitration) [4] 4.5-1,2 3.77 µs Target Select to Command...
  • Page 83 Barracuda 4XL Product Manual, Rev. B Table 18: Disc drive SCSI timing (Continued) Waveform Waveform Description symbol [1] table [1] Typical timing 0.04 µs Data In Byte Transfer (parameter) 4.5-12 0.04 µs Data Out Byte Transfer (parameter) 4.5-13 0.12 µs Next Data In Byte Access (parameter) 4.5-12 0.12 µs...

  • Page 85: Seagate Technical Support Services

    Online technical support for Seagate products is available on CompuServe. To access our technical support forum, type go seagate . This forum provides information similar to that found on SeaBOARD. In addition, you can type questions or browse through previous questions and answers on the forum messages.
  • Page 86 . (Central time) Monday through Friday. Customer service centers Seagate direct OEM, Distribution, and Systems Integrator customers should contact their Seagate service rep- resentative for warranty information. Other customers should contact their place of purchase. Seagate offers comprehensive customer support for all Seagate drives. These services are available worldwide.
  • Page 87 Barracuda 4XL Product Manual, Rev. B Index buffer-full ratio 12 bulkhead connector 55 bus device reset message 48 Symbols bytes per sector 46 bytes/surface 9 +5 and +12 volt supplies 21 bytes/track 9 Numerics 50 conductor connector 57 cabinet cooling 41 50 conductor flat cable 55 cable 52 50 pin connector 58...
  • Page 88 Barracuda 4XL Product Manual, Rev. B current requirements 21 drive defects list track 31 current value 48 drive failure 16 cylinder boundary 13 drive firmware 48 drive I/O connector 68 drive ID 33 drive ID select 34 daisy-chain 22 drive ID select jumper connector 33 80 conductor 57 drive ID/option select header 33 terminating 55...
  • Page 89 Barracuda 4XL Product Manual, Rev. B single-ended 56 I/O connector 38 fast SCSI transfer rate 55 I/O line 40 Fast-20 SCSI 5 I/O termination 71 fault status 15 identified defect 31 FCC rules and regulations 3 idle condition 23 field repair 16 impedance match/mismatch 55 firmware 48 initiator...
  • Page 90 Barracuda 4XL Product Manual, Rev. B mean time between failure. See MTBF option jumper location 33 media 7 option select header 52 media defect 15 option select jumper 33 media defect induced error 15 options 8 medium error 16 orientation 11 message protocol 52 out-of-plane deflection 42 message protocol system 31...
  • Page 91 SCSI-2/SCSI-3 49 read operation 11 SCSI-2/SCSI-3 mode 44 read power dissipation 23 SCSI-3 (Fast-20) interface 5 read/write head 9 Seagate support service 33 ready 48 sector 12 receive diagnostic results 31 sector interleave 10 recommended mounting 26 sector size 8...
  • Page 92 Barracuda 4XL Product Manual, Rev. B single-ended SCSI driver 7 TP jumper 40 single-ended SCSI receiver 7 TP1 position 40 site installation 16 tracks/inch 9 SMART 17 tracks/surface, total 9 software interleave 13 transfer period 52 source voltage 68 transfer rate 10 spare part 16 troubleshooting 75 spindle 22...
  • Page 94 Seagate Technology, Inc. 920 Disc Drive, Scotts Valley, California 95066-4544, USA Publication Number: 77767500, Rev. B, Printed in USA...

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