Seagate Barracuda 2LP Product Manual
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Seagate Barracuda 2LP Product Manual

Seagate Barracuda 2LP Product Manual

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  • Page 1 sales@artisantg.com artisantg.com (217) 352-9330 | Click HERE Find the TEAC FD-235HF at our website:...
  • Page 2 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ Barracuda 2LP Disc Drive ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○...
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  • Page 4 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ Barracuda 2LP Disc Drive ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○...
  • Page 5 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 6 Revision status summary sheet Sheets Revision Date Writer/Engineer Affected 7/14/94 L. Newman/J. Olson 9/21/94 L. Newman/J. Olson 36, 37, 43, 51, 57, 61, 64, 66 3/20/95 L. Newman/J. Olson 1, 9, 12, 14, 24, 25, 26, 27, 28, 29, 33, 34, 35, 36, 39, 41, 42, 47, 48, 50, 52, 55, 57, 58, 59, 60, 61, 62, 63, 64, 66, 68, 69, 70, 71, 73,...
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  • Page 8: Table Of Contents

    6.2.4 Service life ....................30 6.2.5 Service philosophy ..................30 6.2.6 Installation..................... 30 6.2.7 Service tools ....................30 6.2.8 Hot plugging Barracuda 2LP disc drives ............30 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 9 Barracuda 2LP Product Manual, Rev. D 7.0 Physical/electrical specifications ..................33 AC power requirements .................... 33 DC power requirements .................... 33 7.2.1 Conducted noise immunity ................34 7.2.2 Power sequencing ..................34 7.2.3 12V current profile ..................35 Heat/power dissipation ....................36 Environmental limits ....................
  • Page 10 Figure 12. PYJX temperature measurement locations ..............29 Figure 13. Temperature measurement location (ST32550N shown) ........... 29 Figure 14. Barracuda 2LP drives typical +12V current profile ............. 35 Figure 15. ST31250N/ND and ST32550N/ND mounting configuration dimensions ..... 39 Figure 16. ST31250W/WD and ST32550W/WD mounting configuration dimensions ....40 Figure 17.
  • Page 11 SCSI interface messages supported ................. 59 Table 2. Supported commands ....................60 Table 3. Barracuda 2LP family drive inquiry data–ASA I ............62 Table 4. Barracuda 2LP family drive inquiry data–ASA II ............62 Table 5. Mode sense data, ST31250 default values–ASA I (SCSI-1 implementation) ..... 63 Table 6.

  • Page 12: Scope

    The SCSI-2 Interface Product Manual (part number 77738479) describes general SCSI interface characteristics of this and other families of Seagate drives. Figure 1. Barracuda 2LP disc drive (ST32550N drive shown) Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 13 Barracuda 2LP Product Manual, Rev. D Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 14: Applicable Standard And Reference Documentation

    Barracuda 2LP Product Manual, Rev. D 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. Safety agencies conditionally certify component parts, such as the Barra- cuda disc drive, based on their final acceptability in the end-use product.
  • Page 15 Barracuda 2LP Product Manual, Rev. D Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 16: General Description

    (heads, media, actuator, etc.) as this requires special facilities. The drive contains no replaceable parts. Opening the HDA voids your warranty. Figure 2. Barracuda 2LP disc drive (exploded view) Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 17 Barracuda 2LP Product Manual, Rev. D 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 18: Standard Features

    Barracuda 2LP Product Manual, Rev. D Standard features Barracuda 2LP 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 19: Unformatted And Formatted Capacities

    Barracuda 2LP Product Manual, Rev. D Unformatted and formatted capacities Standard OEM models are formatted to have 512-byte sectors. Barracuda 2LP drives have nine (9) spare sectors per cylinder and one (1) spare cylinder per unit. Formatted Unformatted ST31250 1,020.9 Mbytes 1,205.3 Mbytes...

  • Page 20: Installation

    Barracuda 2LP Product Manual, Rev. D Installation For option jumper locations and definitions refer to Section 10.1. Drive default mode parameters are not normally needed for installation. Refer to Section 11.3.2 for default mode parameters if you need them. • Ensure that the SCSI ID of the drive is not the same as the host adapter.
  • Page 21 Barracuda 2LP Product Manual, Rev. D Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 22: Performance Characteristics

    Barracuda 2LP Product Manual, Rev. D Performance characteristics This section provides performance-related characteristics and features of Barracuda 2LP drives. Internal drive characteristics ST31250 ST32550 Drive capacity, Mbytes unformatted 1,205.3 2,541.3 Read/write data heads, maximum (physical) Bytes per track, average bytes...
  • Page 23 Barracuda 2LP Product Manual, Rev. D during format, at Re-Zero command, at spindle-up, during read-error recov- ery, and during reassign-block functions). You can use the Re-Zero com- mand to reset the thermal compensation timer to let the host know when the interruption for thermal compensation will occur.

  • Page 24: Seek Time

    Barracuda 2LP Product Manual, Rev. D Start TCAL head 10 min. TCAL timer expired? Complete Reset command 10 minute target TCAL timer received a SCSI command? Read SCSI ahead command in pending? progress? heads calibrated? Hold (wait for next Complete...

  • Page 25: General Performance Characteristics

    Barracuda 2LP Product Manual, Rev. D General performance characteristics Minimum sector interleave 1 to 1 Data buffer to/from disc media 512-byte sector Data transfer rate (≤ 1 sector) Minimum 5.30 Mbytes/sec* Maximum 8.94 Mbytes/sec* Data transfer rate (< 1 track) Minimum 3.56 Mbytes/sec*...

  • Page 26: Start/Stop Time

    Barracuda 2LP Product Manual, Rev. D Start/stop time Disabling the Motor Start option causes the motor to start as soon as power is applied, causing the drive to become ready within 30 seconds after DC power is applied at nominal voltage. If a recoverable error condition is detected during the start sequence, the drive executes a recovery procedure which may cause the drive to become ready in excess of 30 seconds.

  • Page 27: Caching Write Data

    Barracuda 2LP Product Manual, Rev. D 2. When a requested logical block is reached that is not in any segment, the drive fetches it and any remaining requested logical block addresses from the disc and puts them in a segment of the cache. The drive transfers the remaining requested logical blocks from the cache to the initiator in accordance with the “buffer-full”...

  • Page 28: Synchronized Spindle Operation

    Barracuda 2LP Product Manual, Rev. D and cleared, if needed, for any logical blocks that are being written (see the SCSI-2 Interface Product Manual ). If the number of write data logical blocks exceeds the size of the segment being written into when the end of the segment is reached, data is written into the beginning of the same cache segment, overwriting data that was written there at the beginning of the operation.

  • Page 29: Figure 5. Synchronized Reference Signal Characteristics

    Barracuda 2LP Product Manual, Rev. D 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...
  • Page 30 Barracuda 2LP Product Manual, Rev. D 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 31 Barracuda 2LP Product Manual, Rev. D Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 32: Reliability Specifications

    Barracuda 2LP Product Manual, Rev. D 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...

  • Page 33: Seek Errors

    HDA. Also, choose the shortest possible path between the air inlet and exit to minimize the travel length of air heated by the Barracuda 2LP drive and other heat sources within the rack, cabinet, or drawer environment.

  • Page 34: Figure 6. Air Flow Pattern (St32550N Drive Shown)

    Barracuda 2LP Product Manual, Rev. D 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 35: Figure 7. Wygx Temperature Measurement Locations

    Barracuda 2LP Product Manual, Rev. D 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.

  • Page 36: Figure 8. Hyhx Temperature Measurement Locations

    Barracuda 2LP Product Manual, Rev. D Air-flow cooling ST31250ND and ST32550ND differential drives MTBF 800k hours Card Component Reference case temperature (°C) HYHX HYHX Detector HYHX Microprocessor HYHX Driver The air-flow pattern with which the temperature guidelines above were generated is shown in Figure 6 (opposite direction). Local average air velocity was 0.61 msec (120 lfpm) and inlet air temperature to the drive was...

  • Page 37: Figure 9. Jyhx Temperature Measurement Locations

    Barracuda 2LP Product Manual, Rev. D Air-flow cooling ST31250W and ST32550W wide single-ended drives MTBF 800k hours Card Component Reference case temperature (°C) JYHX JYHX Detector JYHX Microprocessor JYHX Driver The air-flow pattern with which the temperature guidelines above were generated is shown in Figure 6 (opposite direction).

  • Page 38: Figure 10. Kyhx Temperature Measurement Locations

    Barracuda 2LP Product Manual, Rev. D Air-flow cooling ST31250WD and ST32550WD wide differential drives MTBF 800k hours Card Component Reference case temperature (°C) KYHX KYHX Detector KYHX Microprocessor KYHX Driver The air-flow pattern with which the temperature guidelines above were generated is shown in Figure 6 (opposite direction).

  • Page 39: Figure 11. Zyhx Temperature Measurement Locations

    Barracuda 2LP Product Manual, Rev. D Air-flow cooling ST31250WC and ST32550WC wide single-ended SCA drives MTBF 800k hours Card Component Reference case temperature (°C) ZYHX ZYHX Detector ZYHX Microprocessor ZYHX Driver The air-flow pattern with which the temperature guidelines above were generated is shown in Figure 6 (opposite direction).

  • Page 40: Figure 12. Pyjx Temperature Measurement Locations

    Barracuda 2LP Product Manual, Rev. D Air-flow cooling ST31250DC and ST32550DC wide differential SCA drives MTBF 800k hours Card Component Reference case temperature (°C) PYJX PYJX Detector PYJX Microprocessor PYJX Driver The air-flow pattern with which the temperature guidelines above were generated is shown in Figure 6 (opposite direction).

  • Page 41: Preventive Maintenance

    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 2LP drives conform to the SCSI-3 standard requirements for glitch-free power-on and power-off. The drive maintains the high-impedance state of the device connector contacts during a power cycle until the transceiver is enabled.
  • Page 42 Barracuda 2LP Product Manual, Rev. D 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. Insert or remove the drive after meeting the following conditions: Caution.
  • Page 43 Barracuda 2LP Product Manual, Rev. D Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 44: Physical/Electrical Specifications

    Barracuda 2LP Product Manual, Rev. D Physical/electrical specifications This section provides information relating to the physical and electrical characteristics of Barracuda 2LP drives. AC power requirements None. DC power requirements The voltage and current requirements for a single drive are shown below.

  • Page 45: Conducted Noise Immunity

    Barracuda 2LP Product Manual, Rev. D See Section 7.2.1 “Conducted noise immunity.” Specified voltage toler- ance includes ripple, noise, and transient response. At power-up, the motor current regulator limits the 12V current to an average value of less than 1.4A, although instantaneous peaks may exceed this value.

  • Page 46: Current Profile

    Nominal (average) curve Minimum AC TIME (S) Figure 14. Barracuda 2LP drives typical + + + + + 12V current profiles Power is applied to the drive. Controller self-tests are performed. The spindle begins to accelerate under current limiting after performing internal diagnostics.

  • Page 47: Heat/Power Dissipation

    Barracuda 2LP Product Manual, Rev. D Heat/power dissipation The heat and power dissipation values for your drive are listed below. ST31250 ST31250 N/W/WC ND/WD/DC Typical seek and read power dissipation* (35 BTUs/hr) (41 BTUs/hr) Typical power dissipation under idle conditions...

  • Page 48: 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 49: Air Cleanliness

    Barracuda 2LP Product Manual, Rev. D 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 5-375 Hz @ 0.5 G in the Z axis...

  • Page 50: Mechanical Specifications

    Barracuda 2LP Product Manual, Rev. D Mechanical specifications The following nominal dimensions do not include the decorative front-panel accessory. Refer to the appropriate figure listed below for your drive’s mounting configuration dimensions. Maintain a minimum clearance of 0.050 inches from the PWA side of the drive, except in the mounting locations.

  • Page 51: Figure 16. St31250W/Wd And St32550W/Wd Mounting Configuration Dimensions

    Barracuda 2LP Product Manual, Rev. D Notes: .050 in. (1.27mm) minimum clearance 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 52: Figure 17. St31250Wc/Dc And St32550Wc/Dc Mounting Configuration Dimensions

    Barracuda 2LP Product Manual, Rev. D Notes: .050 in. (1.27mm) minimum clearance 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 53: Drive Orientation

    Barracuda 2LP Product Manual, Rev. D 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 54: Media Characteristics

    Barracuda 2LP Product Manual, Rev. D Media characteristics This section provides information regarding the media used in Barracuda 2LP disc drives. Media description The media used on the drive has a diameter of approximately 95 mm (3.7 inches). The aluminum substrate is coated with a thin-film magnetic mate- rial, which has a proprietary protective layer for improved durability and environmental protection.
  • Page 55 Barracuda 2LP Product Manual, Rev. D Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 56: Defect And Error Management

    Barracuda 2LP Product Manual, Rev. D 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 57 Barracuda 2LP Product Manual, Rev. D Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 58: Option/Configuration Headers

    Barracuda 2LP Product Manual, Rev. D 10.0 Option/configuration headers This section describes how to configure Barracuda 2LP 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.
  • Page 59 Barracuda 2LP Product Manual, Rev. D Block Pins Function ST31250N and ST32550N 1 & 2 Terminator power from the drive (drive supplies terminator power to its own terminators). 1 & 3 Terminator power to the SCSI bus (drive supplies power to an external terminator) 2 &...
  • Page 60 Barracuda 2LP Product Manual, Rev. D 7 & 8* SCSI ID bit 0 9 & 10* SCSI ID bit 1 11 & 12*SCSI ID bit 2 13 & 14 Reserved 15 & 16 Reserved 17 & 18 Reserved 19 & 20 Reserved *See Figure 19 to set the SCSI ID.

  • Page 61: St31250W/Wd And St32550W/Wd Configuration

    Barracuda 2LP Product Manual, Rev. D 10.1.2 ST31250W/WD and ST32550W/WD configuration Figure 20 illustrates ST31250W/WD and ST32550W/WD option select jumper connectors. ST31250W and ST32550W DC Power ST31250WD and J1 Connector Pin 1 Pin 2 Connector ST32550WD Pin 1 J1 Connector...
  • Page 62 Barracuda 2LP Product Manual, Rev. D Block Pins Function ST31250W and ST32550W 1 & 2 Terminator power from the drive (drive supplies terminator power to its own terminators). 1 & 3 Terminator power to the SCSI bus (drive supplies power to an external terminator) 2 &...
  • Page 63 Barracuda 2LP Product Manual, Rev. D Unit active LED pin (–) Enable SCSI terminator (ST31250W and ST32550W drives) Ground (+) 5 volts No connection 13– 20 Reserved 1 & 2* SCSI ID bit 0 3 & 4* SCSI ID bit 1 5 &...

  • Page 64: St31250Wc/Dc And St32550Wc/Dc Configuration

    Barracuda 2LP Product Manual, Rev. D 10.1.3 ST31250WC/DC and ST32550WC/DC configuration Figure 21 illustrates ST31250WC/DC and ST32550WC/DC option select jumper connectors and SCSI ID. Pin 1 Pin 1 SCSI I/O Connector (SCA) Pin 1 End Pin 1 (front view of J4)
  • Page 65 Barracuda 2LP Product Manual, Rev. D 11 & 12 Delay motor start. Jumper installed causes a 10-second delay for each SCSI ID number plus a maximum power-up delay of 3 seconds before starting the spindle motor automati- cally. Default is no jumper.

  • Page 66: Synchronized Spindles Interface

    Barracuda 2LP Product Manual, Rev. D 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.

  • Page 67: Figure 23. St31250N/Nd And St32550N/Nd Configuration Select Header

    Barracuda 2LP Product Manual, Rev. D 10.2.1.2 Termination The reference index signal (SSREF+) is terminated with a 2.21K ohm resistor. Each single-ended drive has a terminator resistor located on the main PCB. The terminator resistor is not removable and is always in the circuit.

  • Page 68: Grounding

    Grounding Signal ground (PCB) and HDA ground are connected together in the Barracuda 2LP family drives— Do not separate this connection. Maximizing the contact area between HDA ground and system ground may reduce radiated emissions. If you do not want the system chassis to be connected to the HDA/PCB ground, you must provide a nonconductive (electrically isolating) method of mounting the drive in the host equipment.
  • Page 69 Barracuda 2LP Product Manual, Rev. D Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 70: Interface Requirements

    SCSI interface messages supported Table 1 lists the messages supported by the Barracuda SCSI-1 and SCSI- 2 modes. ASA I is Seagate’s first generation of advanced SCSI architecture firmware. ASA II is Seagate’s second generation of advanced SCSI archi- tecture firmware.

  • Page 71: Scsi Interface Commands Supported

    SCSI interface commands supported Table 2 lists the SCSI interface commands supported in SCSI-1 and SCSI-2 modes. Barracuda 2LP family drives can be changed back and forth between SCSI-1 and SCSI-2 modes, using the Change Definition com- mand. Standard OEM drives are shipped set to operate in SCSI-2 mode.
  • Page 72 Barracuda 2LP Product Manual, Rev. D Supported by Command ASA I ASA I ASA II Command name code SCSI-1 SCSI-2 SCSI-2 Read Read Buffer Read Capacity Read Defect Data Read Extended Read Long Reassign Blocks Receive Diagnostic Results Supported Diagnostics Pages...

  • Page 73: Inquiry Data

    Tables 3 and 4 list the Inquiry command data that the drive should return to the initiator per the format provided in the SCSI-2 Interface Product Manual. Table 3. Barracuda 2LP family drive inquiry data–ASA I Bytes Data (hex) 0-15 00 00 **...

  • Page 74: Mode Sense Data

    Barracuda 2LP Product Manual, Rev. D 11.3.2 Mode sense data Tables 5, 6, 7, and 8 list the data-byte values the drive returns in response to the Mode Sense command pages for SCSI-1 and SCSI-2 implementation (see the SCSI-2 Interface Product Manual).

  • Page 75: Table 7. Mode Sense Data, St31250 Default Values-Asa I (Scsi-2 Implementation)

    Barracuda 2LP Product Manual, Rev. D Table 7. Mode sense data, ST31250 default values–ASA I (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...

  • Page 76: Table 9. Mode Sense Data, St31250 Default Values-Asa Ii (Scsi-2 Implementation)

    Barracuda 2LP Product Manual, Rev. D Table 9. Mode sense data, ST31250 default values–ASA II (SCSI-2 implementation) Reserved for ST31250 ASA II (SCSI-2 mode sense data) Table 10. Mode sense data, ST32550 default values–ASA II (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...

  • Page 77: Scsi Bus Conditions And Miscellaneous Features Supported

    Barracuda 2LP Product Manual, Rev. D 11.4 SCSI bus conditions and miscellaneous features supported Asynchronous SCSI bus conditions supported by the drive are listed in Table 11. 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 78: Synchronous Data Transfer

    Transfer rate (decimal) (M times 4 nanoseconds) (mega transfers/second) 10.0 6.66 3.33 2.86 11.5.2 REQ/ACK offset The maximum REQ/ACK offset supported by Barracuda 2LP drives is 15 (0Fh). Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 79: Dc Cable And Connector

    +5V DC 11.7 SCSI physical interface Figures 26, 27, and 28 illustrate the physical interface on Barracuda 2LP drives. Locations of the DC power connector, the SCSI interface connector, and the drive select and option select headers are shown. Details of the physical, electrical, and logical characteristics are given below.

  • Page 80: Figure 27. St31250W/Wd And St32550W/Wd Physical Interface

    Barracuda 2LP Product Manual, Rev. D ST31250W and ST32550W J1 Connector DC Power Pin 1 Connector ST31250WD and ST32550WD Pin 1 J1 Connector SCSI I/O Connector Figure 27. ST31250W/WD and ST32550W/WD physical interface SCSI I/O Connector (SCA) Pin 1 Figure 28. ST31250WC/DC and ST32550WC/DC physical interface...

  • Page 81: Physical Characteristics

    11.7.1.2 Cable requirements Sections 11.7.1.2.1, 11.7.1.2.2, and 11.7.1.2.3 describe the single-ended, differential, and general cable requirements for Barracuda 2LP drives. 11.7.1.2.1 Single-ended I/O circuits (ST31250N, ST31250W, ST31250WC, ST32550N, ST32550W, and ST32550WC drives) The maximum total cable length for use with drives having single-ended I/ O driver and receiver circuits is 6 meters (19.7 feet) when operating at line...

  • Page 82: Connector Requirements

    Barracuda 2LP Product Manual, Rev. D implies a cable characteristic impedance of 122 ohms. Differential I/O cable pin assignments for ST31250ND and ST32550ND drives are shown in Table 18. Differential I/O cable pin assignments for ST31250WD and ST32550WD drives are shown in Table 20.

  • Page 83: Electrical Description

    Note. All single-ended terminators must be ANSI SCSI-2 alternative 2 active terminators. Typical single-ended driver and receiver circuits for the Barracuda 2LP family are shown in Figure 28. Use terminator circuits only when the disc drive is first or last on the daisy chain. (See Note 1 following Figure 29.)

  • Page 84: Figure 29. Single-Ended Transmitters And Receivers

    Barracuda 2LP Product Manual, Rev. D Receiver characteristics Single-ended drives use an ANSI SCSI single-ended receiver with hyster- esis gate or equivalent as a line receiver. Line Driver Line Receiver Transmitter Receiver +2.85V +2.85V (or transceiver) Flat Cable Pair Figure 29. Single-ended transmitters and receivers Notes: [1] Part of active terminator circuits.

  • Page 85: Figure 30. Typical Differential I/O Line Transmitter/Receiver And Terminators

    Barracuda 2LP Product Manual, Rev. D Output characteristics Each signal driven by differential interface drives should have the following output characteristics when measured at the disc drive’s SCSI connector: Low-level output voltage* = 2.0V maximum at low-level output current = 55 milliamps High-level output voltage* = 3.0V minimum at high-level output current...
  • Page 86 Barracuda 2LP Product Manual, Rev. D [3] Total interface cable length should not exceed 82.1 feet (25 meters) from the host to the end of the daisy chain. [4] You must provide terminators. 11.7.3.3 Terminator requirements ST31250N, ST31250W, ST32550N and ST32550W drives Internal disc drive I/O termination consists of active circuits contained in permanently mounted IC terminator packs on the main PCB.

  • Page 87: Scsi Non-Wide Physical Interface

    Barracuda 2LP Product Manual, Rev. D 11.8 SCSI non-wide physical interface Ref. (15.24) (10.67) Typ. (5.08) .065 x 45° Chamfer Typ. (1.65) Pin 1 .037 Ref. Typ. Typ. (.94) (6.60) .335 ± .010 (8.50) .100 (2.54) .025 +.001 Sq. Contact –.002 Dia.

  • Page 88: Table 14. Single-Ended Cable Pin Assignments For St31250N And St32550N Drives

    Barracuda 2LP Product Manual, Rev. D Table 14. Single-ended cable pin assignments (non-shielded connector) for ST31250N and ST32550N drives Signal Pin number Signal Pin number −DB (0) GROUND −DB (1) GROUND −DB (2) −ATN −DB (3) GROUND −DB (4) −BSY −DB (5)

  • Page 89: Table 15. Differential Cable Pin Assignments For St31250Nd And St32550Nd Drives

    Barracuda 2LP Product Manual, Rev. D Table 15. Differential cable pin assignments (non-shielded connector) for ST31250ND and ST32550ND drives + + + + + Signal name* − − − − − Signal name* Pin number SHIELD GND GROUND −DB (0) DB (0) −DB (1)

  • Page 90: Scsi Wide Physical Interface

    Barracuda 2LP Product Manual, Rev. D 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...

  • Page 91: Table 16. Single-Ended Contact Assignments For St31250W And St32550W Drives

    Barracuda 2LP Product Manual, Rev. D Table 16. Single-ended contact assignments (P cable) for ST31250W and ST32550W drives Signal Connector Connector Signal name contact number contact number name GROUND –DB (12) GROUND –DB (13) GROUND –DB (14) GROUND –DB (15) GROUND –DB (P1)

  • Page 92: Table 17. Differential Contact Assignments For St31250Wd And St32550Wd Drives

    Barracuda 2LP Product Manual, Rev. D Table 17. Differential contact assignments (P cable) for ST31250WD and ST32550WD 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 93: Scsi Single-Connector Attachment (Sca) Physical Interface

    Barracuda 2LP Product Manual, Rev. D 11.10 SCSI single-connector attachment (SCA) physical interface Side View 7.00 (.276) 1.52 (.060) 2.70 12.70 (.106) (.500) 1.32 (.052) Section X–X 57.87 (2.278) –0.15 + .000 – .006 0.15 –Y– Front View Pin 1 ±...

  • Page 94: Table 18. Sca Contact Assignments For St31250Wc And St32550Wc Drives

    Barracuda 2LP Product Manual, Rev. D Table 18. SCA contact assignments for ST31250WC/ST32550WC drives + + + + + Signal − − − − − Signal Connector Connector name contact contact name 12V GROUND 12V GROUND 12V GROUND 12V GROUND...

  • Page 95: Table 19. Sca Contact Assignments For St31250Dc And St32550Dc Drives

    Barracuda 2LP Product Manual, Rev. D Table 19. SCA contact assignments for ST31250DC /ST32550DC drives + + + + + Signal − − − − − Signal Connector Connector name contact contact name 12V GROUND 12V GROUND 12V GROUND 12V GROUND...

  • Page 96: Table 20. Disc Drive Scsi Timing

    Barracuda 2LP Product Manual, Rev. D Table 20. 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 Target select to command 4.5-1...
  • Page 97 Barracuda 2LP Product Manual, Rev. D 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 Next data out byte access (parameter) 4.5-13...

  • Page 98: Index

    Barracuda 2LP Product Manual, Rev. D Index conducted noise immunity 34 connector parts, DC power connection 68 contact assignments differential (P cable) 81 Symbols SCA 84 12V current profile 35 single-ended (P cable) 80 96-bit Reed-Solomon error correction code 7...
  • Page 99 Barracuda 2LP Product Manual, Rev. D EMC/regulatory requirements, meeting 3 Enable Motor Start option 48, 51, 53 J1, jumper connector 48 environmental interference 21 J2, jumper connector 48, 51, 53 environmental limits J4, jumper connector 48, 51, 54 effective altitude 37...
  • Page 100 Barracuda 2LP Product Manual, Rev. D contact assignments for DC drives 84 panel, front 8 contact assignments for WC drives 83 performance physical interface 82 general 7, 14 recommended mating part numbers 72 list of characteristics 11 terminating WC/DC drives 72...
  • Page 101 Barracuda 2LP Product Manual, Rev. D I/O, cable requirements 70 SCSI drivers and receivers 7 vibration single-ended I/O non-operating 38 cable requirements 70 operating single-unit shipping pack kit 8 abnormal 38 spare reallocation scheme 8 normal 38 spindle voltage requirements 33...
  • Page 102 Barracuda 2LP Product Manual, Rev. D Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 103 Barracuda 2LP Product Manual, Rev. D Seagate Technology, Inc. 920 Disc Drive, Scotts Valley, California 95066-4544, USA Publication Number: 83328930, Rev. D, Printed in USA Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

This manual is also suitable for:

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