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Installation Manual
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Barracuda 2, 2HP Disc Drive
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ST12450W/WD
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Product Manual, Volume 1
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Table of Contents
Related Manuals for Seagate ST12450W
Summary of Contents for Seagate ST12450W
- Page 1 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ST12450W/WD ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○...
- Page 3 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ST12450W/WD ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○...
- 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) 1/25/94 L. Newman/J. Olson A (preliminary-02) 2/15/94 L. Newman/J. Olson 3/29/94 L. Newman/J. Olson Note. Product Manual 83328900 is Volume 1 of a two-volume document with the SCSI interface information in the Volume 2 SCSI-2 Interface Product Manual, Part Number 77738479.
- Page 7 ST12450W/WD Product Manual, Rev. A 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 ST12450W/WD Product Manual, Rev. A Physical/electrical specifications ................... 27 AC power requirements .................... 27 DC power requirements .................... 27 7.2.1 Conducted noise immunity ................28 7.2.2 Power sequencing ..................28 7.2.3 12V current profile ..................29 Heat/power dissipation ....................30 Environmental limits ....................
- Page 9 ST12450W/WD Product Manual, Rev. A 11.7 SCSI physical interface ..................... 53 11.7.1 Physical characteristics ................53 11.7.2 Connector requirements ................54 11.7.3 Electrical description ..................54 11.8 SCSI wide physical interface ..................59 12.0 Options ..........................65 12.1 Front panel........................ 65 12.2 Single-unit shipping pack ..................
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Page 11: Scope
ST12450W/WD Product Manual, Rev. A Scope This manual describes Seagate Technology®, Inc. Barracuda™ 2, 2HP (2 head parallel) disc drives. Barracuda drives support the Small Computer System Interface-2 (SCSI- 2) as described in the ANSI SCSI and SCSI-2 interface specifications to the extent described in this manual. -
Page 13: Applicable Standard And Reference Documentation
ST12450W/WD Product Manual, Rev. A Applicable standard and reference documentation Seagate takes all reasonable steps to insure 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: General Description
ST12450W/WD Product Manual, Rev. A 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 2, 2HP drive has two read/write channels on the circuit board. - Page 16 ST12450W/WD Product Manual, Rev. A 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.
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Page 17: Standard Features
• 1:1 interleave • Zone bit recording (ZBR) • Vertical, horizontal, or top-down mounting • Dynamic spindle brake • Permanently mounted IC terminators (ST12450W models only) • Synchronous spindle capability • 1,024 Kbyte data buffer (see Section 5.5) Performance • Simultaneously processes data for two read/write channels (heads) •... -
Page 18: Unformatted And Formatted Capacities
ST12450W/WD Product Manual, Rev. A Unformatted and Formatted Capacities Standard OEM models are formatted to have 512-byte sectors. ST12450 drives have nine (9) spare sectors per cylinder and one (1) spare cylinder per unit. Formatted Unformatted 1,849 Mbytes 2,437 Mbytes Users having the necessary equipment may modify the data block size before issuing a format command to obtain different formatted capacities. -
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 single-ended (ST12450W) drives by enabling this feature with a jumper (see Figure 14). External terminators are required for differential (ST12450WD) drives. -
Page 21: Performance Characteristics
ST12450W/WD Product Manual, Rev. A Performance characteristics This section provides performance-related characteristics and features of Barracuda 2, 2HP drives. Internal drive characteristics Drive capacity, Mbytes unformatted 2,437 Read/write data heads, maximum (physical) Read/write data heads, maximum (logical) Bytes per track, average bytes... -
Page 22: Figure 3. Oem Interruptible Thermal Calibration Implementation
ST12450W/WD Product Manual, Rev. A Refer to Section 11.8 and to the SCSI-2 Interface Product Manual (part number 77738479) for additional timing details. Start TCAL 10 min. head timer expired? target target received a SCSI received a SCSI 10 minute... -
Page 23: Seek Time
ST12450W/WD Product Manual, Rev. A 5.2.1 Seek time Drive level Drive including Barracuda controller overhead msec without disconnect 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
ST12450W/WD Product Manual, Rev. A General performance characteristics Minimum sector interleave 1 to 1 Data buffer to/from disc media (512-byte sector) Data transfer rate (≤ 1 sector) Minimum 8.56 Mbytes/sec* Maximum 14.11 Mbytes/sec* Data transfer rate (< 1 track) Minimum 6.57 Mbytes/sec*... -
Page 25: Start/Stop Time
ST12450W/WD Product Manual, Rev. A Start/stop time Disabling the Motor Start option causes the drive to become ready within 30 seconds after DC power is applied at nominal voltage. This means the motor starts as soon as power is applied. During this time the drive responds to some commands over the SCSI interface. -
Page 26: Adaptive Read Lookahead
ST12450W/WD Product Manual, Rev. A 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 27: Caching Write Data
ST12450W/WD Product Manual, Rev. A Caching write data Write caching is a drive-write operation, which uses a drive’s buffer storage area where data to be written to the disc is stored while the drive performs the Write command. Write caching is enabled along with read caching. Default is cache enabled. -
Page 28: Figure 5. Synchronized Reference Signal Characteristics
ST12450W/WD Product Manual, Rev. A The host can reconfigure the drive any time after power-up to be the master or a slave by using the Mode Select command on the Rigid Disc Drive Geometry page. The master provides the reference signal to which all other drives phase-lock, including the master. - Page 29 ST12450W/WD Product Manual, Rev. A SCSI interface factors The Rotational Position Locking (RPL) field in byte 17 (bits 0 and 1) of the Rigid Disc Drive Geometry mode parameters page (page 04h) is used for enabling and disabling spindle synchronization mode (see the SCSI-2 Interface Product Manual ).
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Page 31: Reliability Specifications
ST12450W/WD Product Manual, Rev. A 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 32: Seek Errors
ST12450W/WD Product Manual, Rev. A 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. After detecting an initial seek error, the drive automatically reseeks to the addressed track up to three times. -
Page 33: Figure 6. Air Flow
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. Air flow (ST12450W shown) -
Page 34: Figure 7. Gyhx Temperature Measurement Locations
ST12450W/WD Product Manual, Rev. A 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 35: Figure 8. Rygx Temperature Measurement Locations
ST12450W/WD Product Manual, Rev. A Air-flow cooling ST12450WD differential MTBF 500k hours Card Component Reference case temperature (°C) RYGX Transmitter RYGX Detector RYGX VIC 2 RYGX Flash PROM RYGX Transceiver HDA housing Figure 9 The air-flow pattern with which the temperature guidelines above were generated is shown in Figure 6. -
Page 36: Preventive Maintenance
ST12450W/WD Product Manual, Rev. A 6.2.3 Preventive maintenance No preventive maintenance is required. 6.2.4 Service life The drive has a useful service life of five 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 37: Physical/Electrical Specifications
ST12450W/WD Product Manual, Rev. A Physical/electrical specifications This section provides information relating to the physical and electrical characteristics of Barracuda 2, 2HP drives. AC power requirements None. DC power requirements The voltage and current requirements for a single drive are shown below. -
Page 38: Conducted Noise Immunity
ST12450W/WD Product Manual, Rev. A continued from previous page At power-up, the motor current regulator limits the 12V current to an average value of less than 2.0A, although instantaneous peaks may exceed this value. These peaks should measure 5 msec duration or less. -
Page 39: V Current Profile
ST12450W/WD Product Manual, Rev. A 7.2.3 12V current profile Figure 10 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 10. Typical Barracuda 2, 2HP drive + + + + + 12V current profile Power is applied to the drive. -
Page 40: Heat/Power Dissipation
ST12450W/WD Product Manual, Rev. A Heat/power dissipation The heat and power dissipation values for your drive are listed below. ST12450W ST12450WD Typical seek and read power dissipation of DC power (58 BTUs/hr) (62 BTUs/hr) average at nominal voltages Typical power dissipation... -
Page 41: Shock And Vibration
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 42: Air Cleanliness
ST12450W/WD Product Manual, Rev. A 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 Vibration may be applied in the X, Y, or Z axis. -
Page 43: Mechanical Specifications
ST12450W/WD Product Manual, Rev. A Mechanical specifications The following nominal dimensions do not include the decorative front-panel accessory. Refer to Figure 11 for detailed mounting configuration dimen- sions. Height 1.63 in 41.4 mm Width 4.00 in 101.6 mm Depth 5.97 in 151.6 mm... -
Page 44: Drive Orientation
ST12450W/WD Product Manual, Rev. A 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, however, 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 45: Media Characteristics
ST12450W/WD Product Manual, Rev. A Media characteristics This section provides information regarding the media used in Barracuda 2, 2HP 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 material, which has a proprietary protective layer for improved durability and environ- mental protection. -
Page 47: Defect And Error Management
ST12450W/WD Product Manual, Rev. A 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 49: Option/Configuration Headers
ST12450W/WD Product Manual, Rev. A 10.0 Option/configuration headers This section describes how to configure Barracuda 2, 2HP 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 50: Figure 14. Barracuda Drive Id And Option Select Headers
ST12450W/WD Product Manual, Rev. A Figure 14 illustrates the drive’s ID and option select jumper connectors. SCSI Pin 1 Connector SCSI ID = 0 SCSI ID = 1 SCSI ID = 2 SCSI ID = 3 SCSI ID = 4... - Page 51 (pos). Pin 10 is current limited through a 1K ohm, 1/10W resistor. 11 & 12 Spindle sync cable connector. Pin 11 is the SSREF+ or reference index signal. Pin 12 is Gnd. * Valid for single-ended (ST12450W) drives only. ** See Figure 14 to set the SCSI ID.
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Page 52: Synchronized Spindles Interface
ST12450W/WD Product Manual, Rev. A 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 Sections 10.2.1, 10.2.1.2, and 10.2.1.3. -
Page 53: Grounding
ST12450W/WD Product Manual, Rev. A 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 55: Interface Requirements
ST12450W/WD Product Manual, Rev. A 11.0 Interface requirements This section describes the Barracuda 2, 2HP interface requirements. 11.1 General description The major portion of the interface requirements/implementation is de- scribed in the SCSI-2 Interface Product Manual (part number 77738479). 11.2... -
Page 56: Scsi Interface Commands Supported
ST12450W/WD Product Manual, Rev. A 11.3 SCSI interface commands supported Table 3 lists the SCSI interface commands supported in SCSI-1 and SCSI-2 modes. Barracuda 2, 2HP family drives can be changed back and forth between SCSI-1 and SCSI-2 modes using the Change Definition command. - Page 57 ST12450W/WD Product Manual, Rev. A continued from previous page Command Supported by: code SCSI-1 SCSI-2 Command name Receive Diagnostic Results Supported Diagnostics Pages Translate Page Send Diagnostics Page Supported Diagnostics Pages Translate Page Read Capacity Read Extended Write Extended Seek Extended...
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Page 58: Inquiry Data
R# Four ASCII digits representing the last four digits of the product firmware release number. S# Eight ASCII digits representing the eight digits of the product serial number. D# Reserved 0000. [ ] Bytes 18 through 23 reflect the model of the drive (ST12450W shown). 11.3.2 Mode sense data... - Page 59 ST12450W/WD Product Manual, Rev. A Table 5. Mode sense data, Barracuda 2, 2HP 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...
- Page 60 ST12450W/WD Product Manual, Rev. A Table 6. Mode sense data, Barracuda 2, 2HP 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...
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Page 61: Scsi Bus Conditions And Miscellaneous Features Supported
ST12450W/WD Product Manual, Rev. A 11.4 SCSI bus conditions and miscellaneous features supported Asynchronous SCSI bus conditions supported by the drive are listed in Table 7. 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 62: Synchronous Data Transfer
ST12450W/WD Product Manual, Rev. A 11.5 Synchronous data transfer The data transfer period to be used by the drive and the initiator is established by an exchange of messages during the Message Phase of operation. See the section on message protocol in the SCSI-2 Interface Product Manual. -
Page 63: Scsi Physical Interface
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. SCSI I/O... -
Page 64: Connector Requirements
0.1 meter (0.33 feet) is allowed off the mainline interconnection with any connected equipment. An ideal impedance match with cable terminators implies a cable characteristic impedance of 132 ohms. Single-ended I/O cable pin assignments for ST12450W drives are shown in Table 10. 11.7.1.2.2... -
Page 65: Figure 18. Single-Ended Transmitters And Receivers
ST12450W/WD Product Manual, Rev. A 11.7.3.1 Single-ended drivers/receivers Typical single-ended driver and receiver circuits for the Barracuda 2, 2HP family are shown in Figure 18. Terminator circuits shown are needed only when the disc drive is first or last on the daisy chain. (See Note 1 following Figure 18.) - Page 66 ST12450W/WD Product Manual, Rev. A 11.7.3.2 Differential drivers/receivers Typical differential driver and receiver circuits used by ST12450WD drives are shown in Figure 19. The differential drives have no provisions for terminator circuits. Differential signals All differential interface signals consist of two lines denoted +SIGNAL and –SIGNAL.
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Page 67: Figure 19. Typical Differential I//O Line Transmitter/Receiver And Terminators
ST12450W/WD Product Manual, Rev. A Input characteristics Each signal received by differential interface drives should have the following input characteristics when measured at the disc drive SCSI connector: Input current on either input = +2.0 milliamps maximum (includes both receivers and passive drivers) This requirement is met with the input voltage varying between –7V DC and... - Page 68 ST12450W/WD Product Manual, Rev. A 11.7.3.3 Terminator requirements ST12450W Internal disc drive I/O termination consists of active circuits contained in permanently mounted IC terminator packs on the main PCB. All single initiator/single target (non-daisy-chain) applications require you to terminate the initiator and drive.
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Page 69: Scsi Wide Physical Interface
ST12450W/WD Product Manual, Rev. A 11.8 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 70 ST12450W/WD Product Manual, Rev. A Table 10. Single-ended contact assignments (P cable) for ST12450W 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) GROUND –DB (0)
- Page 71 ST12450W/WD Product Manual, Rev. A Table 11. Differential contact assignments (P cable) for ST12450WD 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) DB (P1) –DB (P1)
- Page 72 ST12450W/WD Product Manual, Rev. A Table 12. 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 73 ST12450W/WD Product Manual, Rev. A 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...
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Page 75: Options
ST12450W/WD Product Manual, Rev. A 12.0 Options All options are incorporated or packaged at the manufacturing facility. 12.1 Front panel The standard front panel is black plastic. You may order other colors. Each panel has a single rectangular green LED indicator lens that, when glowing, indicates the drive is selected. -
Page 77: Accessories
ST12450W/WD Product Manual, Rev. A 13.0 Accessories All accessories are designed for you to install. 13.1 Adaptor accessory frame kit Part number 75790701 This kit contains the frame to allow a 3.5-inch drive to be mounted in a 5.25-inch drive bay. It includes mounting hardware, front panel with a green lens, an LED with cable that connects to the remote LED connector, and installation instructions. -
Page 79: Index
ST12450W/WD Product Manual, Rev. A Index data block size, modifying the 8 data buffer 7 data buffer to/from disc media (512-byte sector) data transfer rate (< 1 track) 14 AC power requirements 27 data transfer rate ( ≤ sector) 14... - Page 80 ST12450W/WD Product Manual, Rev. A flaw reallocation performance impact 14 media characteristics 35 flawed sector reallocation 7 media description 35 format drive command execution time miscellaneous for ≥ 512-byte sectors 13 operating features supported 51 formatting 9 miscorrected data transferred 21...
- Page 81 ST12450W/WD Product Manual, Rev. A Reed-Solomon error correction code 7 service reference documents philosophy 26 Barracuda 2, 2HP Installation Guide 3 tools 26 SCSI-2 Reference Manual 3 servo heads, number of 11 reference index signal 42 shock termination 43 non-operating 31...
- Page 82 ST12450W/WD Product Manual, Rev. A unit attention unrecoverable error, defined 21 write data, caching 17 write errors, defined 21 write errors 21 unrecovered data transferred 21 Write Protect option 41 vibration zone bit recording (ZBR) 7 non-operating 32 operating abnormal 32...
- Page 84 Seagate Technology, Inc. 920 Disc Drive, Scotts Valley, California 95066-4544, USA Publication Number: 83328900, Rev. A, Printed in USA...