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Seagate Barracuda ST12550W Product Manual

Seagate Barracuda ST12550W Product Manual

Barracuda 1 and 2 disc drive
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Barracuda 1 and 2 Disc Drive
ST11950N/ND, ST11950W/WD
ST12550N/ND, ST12550W/WD
Product Manual, Volume 1

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Summary of Contents for Seagate Barracuda ST12550W

  • Page 1 Barracuda 1 and 2 Disc Drive ST11950N/ND, ST11950W/WD ST12550N/ND, ST12550W/WD Product Manual, Volume 1...
  • Page 3 Barracuda 1 and 2 Disc Drive ST11950N/ND, ST11950W/WD, ST12550N/ND, ST12550W/WD Product Manual, Volume 1...
  • Page 4 Seagate Technology, Inc. Other product names are registered trademarks or trademarks of their owners. 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 from Seagate Technology, Inc.
  • Page 5 Revision status summary sheet Sheets Revision Date Writer/Engineer Affected A (preliminary-01) 04/05/93 L. Newman/J. Olson A (preliminary-02) 04/20/93 L. Newman/J. Olson A (preliminary-03) 05/01/93 L. Newman/J. Olson 05/11/93 L. Newman/J. Olson B (preliminary-01) 09/15/93 L. Newman/J. Olson 10/18/93 L. Newman/J. Olson C (draft) 10/11/94 L.

  • Page 7: Table Of Contents

    Barracuda 1 and 2 Product Manual, Rev. C Contents 1.0 Scope ..........................2.0 Applicable standard and reference documentation ............2.1 Standards ........................2.2 Applicable reference documents ................... 3.0 General description ......................4.0 Standard features ......................4.1 Performance ......................... 4.1.1 Reliability ......................4.2 Unformatted and formatted capacities ................
  • Page 8 10.0 Option/configuration headers ..................45 10.1 Drive ID/option select headers .................. 45 10.1.1 ST11950N/ND and ST12550N/ND configuration ........... 45 10.1.2 ST11950W/WD and ST12550W/WD configuration ........48 10.2 Synchronized spindles interface ................50 10.2.1 Electrical description ..................50 10.3 Grounding ......................... 52 11.0 Interface requirements ....................
  • Page 9 ST11950W/WD and ST12550W/WD jumper connectors ..........48 SCSI reference index signal driver/receiver combination ..........50 ST11950N/ND and ST12550N/ND configuration select header specification....51 ST11950W/WD and ST12550W/WD configuration select header specification ....51 ST11950N/ND and ST12550N/ND physical interface ............63 ST11950W/WD and ST12550W/WD physical interface ............ 64...
  • Page 10 Differential cable pin assignments (non-shielded connector) for ST11950ND and ST12550ND drives ................72 Single-ended contact assignments (P cable) for ST11950W and ST12550W drives ..74 Single-ended contact assignments (P cable) for ST11950WD and ST12550WD drives ... 75 Disc drive SCSI timing ...................... 76...

  • Page 11: Scope

    (part number 77738479) describes general SCSI interface characteristics of this and other families of Seagate drives. ST11950N/ND and ST11950W/WD drives are classified as Barracuda 1 family drives. ST12550N/ND and ST12550W/WD drives are classified as Barracuda 2 family drives. N/ND type W/WD type Figure 1.
  • Page 12 Barracuda 1 and 2 Product Manual, Rev. C...

  • Page 13: Applicable Standard And Reference Documentation

    Barracuda 1 and 2 Product Manual, Rev. C Applicable standard and reference documentation Seagate takes all reasonable steps to ensure that its products are certifiable to currently accepted standards. Typical applications of these disc drives include customer packaging and subsystem design.
  • Page 14 Barracuda 1 and 2 Product Manual, Rev. C...

  • Page 15: General Description

    Barracuda 1 and 2 Product Manual, Rev. C General description Barracuda drives are low-cost, high-performance, random-access storage devices designed to meet the needs of the original equipment manufacturer (OEM) marketplace. The Barracuda drive’s interface supports multiple initiators, disconnect/ reconnect, self-configuring host software, and automatic features that re- lieve the host from knowing the physical characteristics of the targets (logical block addressing is used).
  • Page 16 Barracuda 1 and 2 Product Manual, Rev. C Barracuda drives use a dedicated landing zone at the innermost radius of the media to eliminate the possibility of destroying or degrading data by landing in the data zone. The drive automatically goes to the landing zone when the power is removed.

  • Page 17: Standard Features

    Barracuda 1 and 2 Product Manual, Rev. C Standard features Barracuda 1 and 2 drives have the following standard features: • Integrated SCSI controller • Single-ended or differential SCSI drivers and receivers • Asynchronous and synchronous data-transfer protocols • Firmware downloadable using a SCSI interface •...

  • Page 18: Unformatted And Formatted Capacities

    Removable resistor modules (SIPs) provide ST11950N and ST12550N drive termination. Permanently mounted active terminator ICs provide ST11950W and ST12550W drive termination; however, the ICs may be disabled by removing the Enable Drive Terminator jumper from J4 pins 11 and 12. See Section 11.7.3.3.

  • Page 19: Installation

    • If the drive is the only device on the bus, attach it to the end of the SCSI bus cable. Internal termination is available on ST11950N, ST11950W, ST12550N, and ST12550W drives (see Sections 10.1 and 11.7.3.4). External terminators are required for ST11950ND, ST11950WD, ST12550ND, and ST12550WD drives.
  • Page 20 Barracuda 1 and 2 Product Manual, Rev. C...

  • Page 21: Performance Characteristics

    Barracuda 1 and 2 Product Manual, Rev. C Performance characteristics This section provides performance-related characteristics and features of Barracuda 1 and 2 drives. Internal drive characteristics ST11950 ST12550 Drive capacity, Mbytes unformatted 2,030 2,572 Read/write data heads, maximum Bytes per track, average 49,768 49,768 Bytes per surface, Mbytes unformatted...

  • Page 22: Oem Interruptible Thermal Compensation Implementation

    Barracuda 1 and 2 Product Manual, Rev. C Start TCAL 10 min. head timer expired? target target received a SCSI received a SCSI 10 minute command? command? timer Target SCSI completes heads heads command in SCSI calibrated? calibrated? progress? command Seek to Select TCAL cyl...

  • Page 23: Seek Time

    Barracuda 1 and 2 Product Manual, Rev. C 5.2.1 Seek time Drive including controller overhead Drive level (msec) without disconnect (msec) read write read write Average typical* 10.0 Single track typical* Full stroke typical* 18.0 20.0 *Typical seek values are measured under nominal conditions of tempera- ture, voltage, and horizontal orientation on a representative sample of drives.

  • Page 24: General Performance Characteristics

    Synchronous transfer rate fast and wide 0.5 to 10 Mbytes/sec (ST11950N/ND and ST12550N/ND) Synchronous transfer rate wide 5.0 to 20 Mbytes/sec (ST11950W/WD and ST12550W/WD) Sector sizes Default 512-byte data blocks Variable in even-sector sizes 180 to 4,096 bytes Read/write consecutive sectors on a track...

  • Page 25: Prefetch/Multi-Segmented Cache Control

    Barracuda 1 and 2 Product Manual, Rev. C (excluding the error recovery procedure). The Motor Start command can also be used to command the drive to stop the spindle (see the Start/Stop command information in the SCSI-2 Interface Product Manual ). There is no power control switch on the drive.

  • Page 26: Adaptive Read Lookahead

    Barracuda 1 and 2 Product Manual, Rev. C Case B. A read command is received and the first logical block address requested is not in any segment of the cache. 1. The drive fetches the requested logical blocks from the disc and transfers them into a segment, then from there to the initiator in accordance with the “buffer-full”...

  • Page 27: Synchronized Spindle Operation

    Barracuda 1 and 2 Product Manual, Rev. C If a 10-byte CDB write command (2Ah) is issued with the data page out (DPO) bit set to 1, no write data is cached, but the cache segments are still checked and cleared, if needed, for any logical blocks that are being written (see the SCSI-2 Interface Product Manual ).

  • Page 28: Synchronized Reference Signal Characteristics

    Barracuda 1 and 2 Product Manual, Rev. C Rotational position locking Note. Mode Select page 4, byte 17, bits 1 and 0. Description Spindle synchronization is disabled (default value) The target operates as a synchronized-spindle slave The target operates as a synchronized-spindle master The target operates as a synchronized-spindle master control (not supported by the disc drive) The VIC 2 LSI on the master drive provides the reference signal (SSREF ).
  • Page 29 Barracuda 1 and 2 Product Manual, Rev. C You may operate the drive with a rotational skew when synchronized. The rotational skew is applied in the retarded direction (lagging the synchronized- spindle master control). A rotational offset of up to 255/256 of a revolution lagging may be selected.
  • Page 30 Barracuda 1 and 2 Product Manual, Rev. C...

  • Page 31: Reliability Specifications

    Barracuda 1 and 2 Product Manual, Rev. C Reliability specifications The following reliability specifications assume correct host and drive interface, including all interface timings, power supply voltages, and environmental requirements. Seek error rate Less than 10 errors in 10 seeks Recoverable error rate Less than 10 errors in 10 bits transferred...

  • Page 32: Seek Errors

    Barracuda 1 and 2 Product Manual, Rev. C 6.1.3 Seek errors A seek error is defined as a failure of the drive to position the heads at the addressed track. There must be no more than one recoverable seek error in physical seek operations.

  • Page 33: Air-Flow Pattern

    Barracuda 1 and 2 Product Manual, Rev. C Above unit Under unit Note. Air flows in the direction shown (back to front) or in reverse direction (front to back) Above unit Under unit Note. Air flows in the direction shown or in reverse direction (side to side) Figure 6.

  • Page 34: Tyfx Temperature Measurement Locations

    Barracuda 1 and 2 Product Manual, Rev. C To confirm that required cooling for the Barracuda electronics and HDA is provided, place the drive in its final mechanical configuration, perform random write/read operations, and after the temperatures stabilize, measure the case temperature of the components listed below. Air-flow cooling ST11950N and ST12550N single-ended drives MTBF...

  • Page 35: Uyfx Temperature Measurement Locations

    Barracuda 1 and 2 Product Manual, Rev. C Air-flow cooling ST11950ND and ST12550ND differential drives MTBF 500k hours Card Component Reference case temperature (°C) UYFX Transmitter UYFX Writer UYFX UYFX VIC2 UYFX 1021 HDA housing Figure 11 The air-flow pattern with which the temperature guidelines above were generated is shown in Figure 6 (opposite direction).

  • Page 36: Tygx Temperature Measurement Locations

    Barracuda 1 and 2 Product Manual, Rev. C Air-flow cooling ST11950W and ST12550W wide single-ended drives MTBF 500k hours Card Component Reference case temperature (°C) TYGX Transmitter TYGX Writer TYGX TYGX VIC2 TYGX 1021 HDA housing Figure 11 The air-flow pattern with which the temperature guidelines above were generated is shown in Figure 6 (opposite direction).

  • Page 37: Pygx Temperature Measurement Locations

    Barracuda 1 and 2 Product Manual, Rev. C Air-flow cooling ST11950WD and ST12550WD wide differential drives MTBF 500k hours Card Component Reference case temperature (°C) PYGX Transmitter PYGX Writer PYGX PYGX VIC2 PYGX 1021 HDA housing Figure 11 The air-flow pattern with which the temperature guidelines above were generated is shown in Figure 6 (opposite direction).

  • Page 38: Preventive Maintenance

    Barracuda 1 and 2 Product Manual, Rev. C 6.2.3 Preventive maintenance No preventive maintenance is required. 6.2.4 Service life The drive has a useful service life of 5 years. Depot repair or replacement of major parts is permitted during this period. 6.2.5 Service philosophy Special equipment is required to repair the drive’s HDA.

  • Page 39: Barracuda 1 And 2 Product Manual, Rev. C

    Barracuda 1 and 2 Product Manual, Rev. C 3. Eliminate all I/O processes for the drive. 4. Wait until the drive motor and discs have come to a complete stop prior to changing the plane of operation, ensuring data integrity. 5.
  • Page 40 Barracuda 1 and 2 Product Manual, Rev. C...

  • Page 41: Physical/Electrical Specifications

    Barracuda 1 and 2 Product Manual, Rev. C Physical/electrical specifications This section provides information relating to the physical and electrical characteristics of Barracuda 1 and 2 drives. AC power requirements None. DC power requirements The voltage and current requirements for a single drive are shown in Tables 1 and 2 (table notes follow Table 2).

  • Page 42: Dc Power Requirements For St11950W/Wd And St12550W/Wd Drives

    Barracuda 1 and 2 Product Manual, Rev. C Table 2. DC power requirements for ST11950W/WD and ST12550W/WD drives ST11950W & ST11950WD & ST12550W ST12550WD Voltage regulation Notes ±5% ±5% ±5% ±5% Amps Max operating current DC 3 1.04 0.95 0.95...

  • Page 43: Conducted Noise Immunity

    Barracuda 1 and 2 Product Manual, Rev. C [7] Operating condition is defined as a third-stroke seek at OD and read one track. A command is issued every 0.07 sec. [8] No terminator power. See Section 11.7.3.4. [9] Idle is defined as track following at OD. [10] Seeking is defined as a third-stroke seek at OD.

  • Page 44: 12V Current Profile

    Barracuda 1 and 2 Product Manual, Rev. C 7.2.3 12V current profile Figure 12 identifies the drive’s 12V current profile. The current during the various times is as shown. 2.85 Peak AC Nominal (average) curve Minimum AC TIME (S) Figure 12. Barracuda 1 and 2 drives typical 12V current profiles Power is applied to the drive.

  • Page 45: Heat/Power Dissipation

    Non-operating temperature should remain between –40° to 158°F (–40° to 70°C) package ambient with a maximum gradient of 36°F (20°C) per hour. This assumes that the drive is packaged in the shipping container designed by Seagate. 7.4.2 Relative humidity The values below assume that no condensation on the drive occurs.

  • Page 46: Effective Altitude (Sea Level)

    50 Gs at a maximum duration of 11 msec (half-sinewave) Shock may be applied in the X, Y, or Z axis. d. Packaged The drive as packaged by Seagate for general freight shipment with- stands a drop test against a concrete floor or equivalent with specifica- tions not exceeding: 20 pounds (8.95 kg) for pack’s gross weight...

  • Page 47: Air Cleanliness

    Barracuda 1 and 2 Product Manual, Rev. C 7.4.4.2 Vibration a. Operating in a normal environment The drive as installed for normal operation operates error free while subjected to continuous vibration not exceeding: 5-400 Hz @ 0.5 G in the X and Y axis Vibration may be applied in the X, Y, or Z axis.

  • Page 48: Mechanical Specifications

    151.6 mm Weight 2.3 lb 1.04 Kg ST11950N/ND and ST12550N/ND drives Figure 13 ST11950W/WD and ST12550W/WD drives Figure 14 Notes: Mounting holes two on each side, 6-32 UNC. Max screw length into side of drive is 0.15 in. (3.81 mm).

  • Page 49: Mounting Configuration Dimensions For W/Wd Drives

    Barracuda 1 and 2 Product Manual, Rev. C Notes: Mounting holes two on each side, 6-32 UNC. Max screw length into side of drive is 0.15 in. (3.81 mm). Mounting holes four on bottom, 6-32 UNC. Max screw length into bottom of drive is 0.15 in.

  • Page 50: Drive Orientation

    Barracuda 1 and 2 Product Manual, Rev. C 7.6.1 Drive orientation The balanced rotary arm actuator design of the drive allows it to be mounted in any orientation. All drive performance evaluations have been done with the drive in horizontal (discs level) and vertical (drive on its side) orientations, which are the two preferred mounting orientations.

  • Page 51: Media Characteristics

    Barracuda 1 and 2 Product Manual, Rev. C Media characteristics This section provides information regarding the media used in Barracuda 1 and 2 disc drives. Media description The media used on the drive has a diameter of approximately 95 mm (3.7 inches).
  • Page 52 Barracuda 1 and 2 Product Manual, Rev. C...

  • Page 53: Defect And Error Management

    Barracuda 1 and 2 Product Manual, Rev. C Defect and error management The drive, as delivered, complies with this product manual. The read error rates and specified storage capacities are not dependent on using defect- management routines by the host (initiator). Defect and error management in the SCSI system involves the drive’s internal defect/error management and SCSI system error considerations (errors in communications between the initiator and the drive).
  • Page 54 Barracuda 1 and 2 Product Manual, Rev. C...

  • Page 55: Option/Configuration Headers

    Barracuda 1 and 2 Product Manual, Rev. C 10.0 Option/configuration headers This section describes how to configure Barracuda 1 and 2 drives using the option headers on the drives. These option headers may be used to customize many functions of the drives for your particular system. 10.1 Drive ID/option select headers The headers described in this section enable you to configure the drive to...

  • Page 56: St11950N/Nd And St12550N/Nd Jumper Connectors

    Barracuda 1 and 2 Product Manual, Rev. C Figure 17 illustrates ST11950N/ND and ST12550N/ND SCSI ID and option select jumper connectors. SCSI Connector Pin 1 SCSI ID = 0 SCSI ID = 1 SCSI ID = 2 SCSI ID = 3 SCSI ID = 4 SCSI ID = 5 SCSI ID = 6...
  • Page 57 Barracuda 1 and 2 Product Manual, Rev. C Block Pins Function ST11950N and ST12550N 1 & 2 Terminator power from the drive 1 & 3 Terminator power to the SCSI bus 2 & 4 Terminator power from the SCSI bus 1 &...

  • Page 58: St11950W/Wd And St12550W/Wd Configuration

    ST11950W/WD and ST12550W/WD configuration SCSI I/O Connector Pin 1 DC Power Connector Figure 18. ST11950W/WD and ST12550W/WD physical interface Figure 19 illustrates ST11950W/WD and ST12550W/WD SCSI ID and option select jumper connectors. Pin 1 SCSI Connector Position SCSI ID = 0...
  • Page 59 Barracuda 1 and 2 Product Manual, Rev. C Block Pins Function ST11950W and ST12550W 1 & 2 Terminator power from the drive 1 & 3 Terminator power to the SCSI bus 2 & 4 Terminator power from the SCSI bus 1 &...

  • Page 60: Synchronized Spindles Interface

    Barracuda 1 and 2 Product Manual, Rev. C 10.2 Synchronized spindles interface The synchronized spindles interface (SSI) allows several drives operating from the same host to operate their spindles at a synchronized rotational rate. Details of the electrical and physical interfaces follow in Section 10.2.1. The system operation is described in Section 5.7.

  • Page 61: St11950N/Nd And St12550N/Nd Configuration Select Header Specification

    ST11950W/WD and ST12550W/WD drives Dimensions of the ST11950W/WD and ST12550W/WD J5 connector mounted on the main PCB to interconnect the drives are shown in Figure 22. It is a 12-pin, 6-position gold header type connector. Only pins 11 and 12 are used for connecting the reference index signal cable, as shown in Figure 19.

  • Page 62: Grounding

    Barracuda 1 and 2 Product Manual, Rev. C 10.3 Grounding Signal ground (PCB) and HDA ground are connected together in the Barracuda 1 and 2 family drives—do not separate this connection. Maximiz- ing the conductive contact area between HDA ground and system ground may reduce radiated emissions.

  • Page 63: Interface Requirements

    Barracuda 1 and 2 Product Manual, Rev. C 11.0 Interface requirements This section describes the Barracuda 1 and 2 interface requirements. 11.1 General description This section contains drive-specific interface information. The major portion of the interface requirements/implementation is described in the SCSI-2 Interface Product Manual (part number 77738479).

  • Page 64: Scsi Interface Commands Supported

    Barracuda 1 and 2 Product Manual, Rev. C 11.3 SCSI interface commands supported Table 4 lists the SCSI interface commands supported in SCSI-1 and SCSI-2 modes. Barracuda 1 and 2 family drives can be changed back and forth between SCSI-1 and SCSI-2 modes, using the Change Definition command. Standard OEM drives are shipped set to operate in SCSI-2 mode.
  • Page 65 Barracuda 1 and 2 Product Manual, Rev. C continued from previous page Command Supported by Command name code SCSI-1 SCSI-2 Read Read Buffer Read Capacity Read Defect Data Read Extended Read Long Reassign Blocks Receive Diagnostic Results Supported Diagnostics Pages Translate Page Release Request Sense...

  • Page 66: Inquiry Data

    ST12550N/ND codes: 53 54 31 32 35 35 30 20 20 20 20 20 20 20 20 20 ST12550W/WD codes: 53 54 31 32 35 35 30 20 20 20 20 20 20 20 20 20 Note. Code 20 indicates an empty-character position.

  • Page 67: Mode Sense Data, St11950 Default Values (Scsi-1 Implementation)

    Barracuda 1 and 2 Product Manual, Rev. C Table 6. Mode sense data, ST11950 default values (SCSI-1 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 Sense 64 00 10 08 Data...

  • Page 68: Mode Sense Data, St11950 Default Values (Scsi-2 Implementation)

    Barracuda 1 and 2 Product Manual, Rev. C Table 7. Mode sense data, ST11950 default values (SCSI-2 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 Sense 9F 00 10 08 Data...

  • Page 69: Mode Sense Data, St12550 Default Values (Scsi-1 Implementation)

    Barracuda 1 and 2 Product Manual, Rev. C Table 8. Mode sense data, ST12550 default values (SCSI-1 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 Sense 64 00 10 08 Data...

  • Page 70: Mode Sense Data, St12550 Default Values (Scsi-2 Implementation)

    Barracuda 1 and 2 Product Manual, Rev. C Table 9. Mode sense data, ST12550 default values (SCSI-2 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 Sense 9F 00 10 08 Data...

  • Page 71: Scsi Bus Conditions And Miscellaneous Features Supported

    Barracuda 1 and 2 Product Manual, Rev. C 11.4 SCSI bus conditions and miscellaneous features supported Asynchronous SCSI bus conditions supported by the drive are listed in Table 10. These conditions cause the SCSI device to perform certain actions and can alter the phase sequence. Other miscellaneous operating features supported are also listed here.

  • Page 72: Synchronous Data Transfer

    (M times 4 nanoseconds) (mega transfers/second) 10.0 6.66 3.33 2.85 2.22 1.81 1.81 1.66 1.53 1.42 1.33 1.25 Table 12. Synchronous data transfer periods for ST11950W/WD and ST12550W/WD drives Transfer period Transfer rate (decimal) (M times 4 nanoseconds) (mega transfers/second) 10.0 6.66 3.33 2.85 2.22...

  • Page 73: Req/Ack Offset

    I/O line terminators, and the drive select and option select headers are shown. Details of the physical, electrical, and logical characteristics are given below. The SCSI operational aspects of Seagate drive interfaces are provided in the SCSI-2 Interface Product Manual. I/O Terminator Packs...

  • Page 74: Physical Characteristics

    Terminate both ends of the daisy chain, but do not terminate any intermediate SCSI device. The single-ended (ST11950N, ST11950W, ST12550N, and ST12550W) drives are equipped with permanently mounted IC terminators, which you can turn on or off using the Enable SCSI Terminator jumper. See Section 10.1 to locate the Enable SCSI Terminator jumper for each drive...

  • Page 75: Connector Requirements

    132 ohms. Single-ended I/O cable pin assignments for ST11950N and ST12550N drives are shown in Table 13. Single-ended I/O cable pin assignments for ST11950W and ST12550W drives are shown in Table 15. 11.7.1.2.2 Differential I/O circuits (ST11950ND, ST11950WD,...

  • Page 76: Electrical Description

    Single-ended circuits use open collector or three-state drivers. ST11950N, ST11950W, ST12550N, and ST12550W drives can be configured to provide SCSI termination (see Section 11.7.3.3). ST11950ND, ST11950WD, ST12550ND and ST12550WD drives use differ- ential interface signals.

  • Page 77: Single-Ended Transmitters And Receivers

    Barracuda 1 and 2 Product Manual, Rev. C Line Driver Line Receiver Transmitter Receiver +2.85V +2.85V (or transceiver) Flat Cable Pair Figure 25. Single-ended transmitters and receivers Notes: [1] Part of active terminator circuits. Enable drive termination when it is first or last on the daisy chain.

  • Page 78: Typical Differential I/O Line Transmitters/Receivers And Terminators

    Barracuda 1 and 2 Product Manual, Rev. C High-level output voltage* = 3.0V minimum at high-level output current = –55 milliamps Differential voltage = 1.0V minimum with common-mode voltage ranges from –7V DC to 12V DC * Measure these voltages between the output terminal and the SCSI device’s logic ground reference.
  • Page 79 Note. All terminators used in the daisy chain must be active terminators as described above. ST11950W and ST12550W drives Internal disc drive I/O termination consists of active circuits contained in permanently mounted IC terminator packs on the main PCB (see Figure 18).

  • Page 80: Scsi Non-Wide Physical Interface

    Barracuda 1 and 2 Product Manual, Rev. C SCSI devices providing terminator power (TERMPWR) must have the following characteristics: • V TERM = 4.50V to 5.25V • 800 mA minimum source drive capability • 1.0A maximum ST11950ND, ST11950WD, ST12550ND and ST12550WD drives You can configure terminator power only from the drive to the SCSI bus (see Section 10.1).

  • Page 81: Single-Ended Cable Pin Assignments (Non-Shielded Connector) For St11950N And St12550N Drives

    Barracuda 1 and 2 Product Manual, Rev. C Table 13. Single-ended cable pin assignments (non-shielded connector) for ST11950N and ST12550N drives Signal Pin number Signal Pin number DB (0) GROUND DB (1) GROUND DB (2) DB (3) GROUND DB (4) DB (5) DB (6) DB (7)

  • Page 82: Differential Cable Pin Assignments (Non-Shielded Connector) For St11950Nd And St12550Nd Drives

    Barracuda 1 and 2 Product Manual, Rev. C Table 14. Differential cable pin assignments (non-shielded connector) for ST11950ND and ST12550ND drives Signal name* Pin number Signal name* SHIELD GND GROUND DB (0) DB (0) DB (1) DB (1) DB (2) DB (2) DB (3) DB (3)

  • Page 83: Scsi Wide Physical Interface

    Barracuda 1 and 2 Product Manual, Rev. C 11.9 SCSI wide physical interface 1.368 .767 .300 (34.75) (19.46) (7.62) .315 (8.00) Position 1 Position 1 Position 1 .740 .870 (18.8) (22.1) 68 Position SCSI Receptacle AMPLIMITE .050 Series 12 Position Auxiliary 4 Position Power Shrouded Post Header Header, Commercial...

  • Page 84: Single-Ended Contact Assignments (P Cable) For St11950W And St12550W Drives

    Barracuda 1 and 2 Product Manual, Rev. C Table 15. Single-ended contact assignments (P cable) for ST11950W and ST12550W drives Signal Connector Connector Signal name contact number contact number name GROUND –DB (12) GROUND –DB (13) GROUND –DB (14) GROUND –DB (15)
  • Page 85 Barracuda 1 and 2 Product Manual, Rev. C Table 16. Differential contact assignments (P cable) for ST11950WD and ST12550WD drives Signal Connector Connector Signal name contact number contact number name DB (12) –DB (12) DB (13) –DB (13) DB (14) –DB (14) DB (15) –DB (15)

  • Page 86: Disc Drive Scsi Timing

    Barracuda 1 and 2 Product Manual, Rev. C 11.10 Disc drive SCSI timing Table 17. Disc drive SCSI timing Waveform Waveform Description symbol [1] table [1] Typical Target select time (no arbitration) < 1 µs < 250 µs Target select time (with arbitration) 4.5-1,2 2.31 µs 2.36 µs...
  • Page 87 Barracuda 1 and 2 Product Manual, Rev. C continued from previous page Waveform Waveform Description symbol [1] table [1] Typical Data in byte transfer (parameter) 4.5-12 0.04 µs Data out byte transfer (parameter) 4.5-13 0.04 µs Next data in byte access (parameter) 4.5-12 0.10 µs 0.12 µs...
  • Page 88 Barracuda 1 and 2 Product Manual, Rev. C...

  • Page 89: Index

    Barracuda 1 and 2 Product Manual, Rev. C formatted 8 Index unformatted 8 conducted noise immunity 33 contact assignments Symbols differential (P cable) 75 12V current profile 34 single-ended (P cable) 74 96-bit Reed-Solomon error correction code 7 cooling, mechanical 40 current requirements 31 AC power requirements 31 acoustics 37...
  • Page 90 Barracuda 1 and 2 Product Manual, Rev. C EMC/regulatory requirements, meeting 3 internal data rate 11 Enable Drive Terminator 49 Enable Motor Start option 47, 49 environmental interference 21 J01, jumper connector 47, 49 environmental limits J2, jumper connector 47 effective altitude 36 shock and vibration 36 jumper connector 49...
  • Page 91 Barracuda 1 and 2 Product Manual, Rev. C safety/regulatory agency compliance 3 SCSI panel, front 8 bus conditions and misc. features 61 Parity Disable option 49 drivers and receivers 7 performance SCSI interface general 7, 14 cable connector requirements 65 list of characteristics 11 electrical description physical...
  • Page 92 Barracuda 1 and 2 Product Manual, Rev. C brake 7 abnormal 37 enabling and disabling 18 normal 37 stopping with the Motor Start command 15 voltage requirements 31 synchronization mode 18 start current 31, 32 start/stop time 14 write data, caching 16 synchronized write errors 21 drive interconnect diagram 17...
  • Page 93 Barracuda 1 and 2 Product Manual, Rev. C...
  • Page 94 Seagate Technology, Inc. 920 Disc Drive, Scotts Valley, California 95066-4544, USA Publication Number: 83327780, Rev. C, Printed in USA...

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Barracuda st12550wdBarracuda st12550nBarracuda st12550ndBarracuda st11950wdBarracuda st11950wBarracuda st11950n ... Show all

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