Table of Contents
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Barracuda 2LP Disc Drive
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ST31250N/ND, ST31250W/WD,
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ST31250WC/DC, ST32550N/ND,
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ST32550W/WD, ST32550WC/DC
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Product Manual, Volume 1
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Table of Contents
Related Manuals for Seagate ST31250N
Summary of Contents for Seagate ST31250N
- Page 1 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ST31250N/ND, ST31250W/WD, ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○...
- Page 3 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ST31250N/ND, ST31250W/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 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 7: Table Of Contents
Contents 1.0 Scope ..........................2.0 Applicable standard and reference documentation ............Standards ......................... Applicable reference documents ................3.0 General description ......................4.0 Standard features ......................Performance ......................4.1.1 Reliability ...................... Unformatted and formatted capacities ..............Options ........................Installation ......................... 5.0 Performance characteristics ................... 11 Internal drive characteristics .................. - Page 8 Defects and errors ....................45 10.0 Option/configuration headers ..................47 10.1 Drive ID/option select headers .................. 47 10.1.1 ST31250N/ND and ST32550N/ND configuration .......... 47 10.1.2 ST31250W/WD and ST32550W/WD configuration ........50 10.1.3 ST31250WC/DC and ST32550WC/DC configuration ........53 10.2 Synchronized spindles interface ................55 10.2.1 Electrical description ..................
- Page 9 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 10 Table 12. Synchronous data transfer periods ................67 Table 13. Mating connector parts ....................68 Table 14. Single-ended cable pin assignments for ST31250N and ST32550N drives ....77 Table 15. Differential cable pin assignments for ST31250ND and ST32550ND drives ....78 Table 16.
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Page 11: Scope
Barracuda 2LP Product Manual, Rev. D Scope This manual describes Seagate Technology®, Inc. Barracuda™ 2LP (low profile) 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 12 Barracuda 2LP Product Manual, Rev. D...
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Page 13: 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 14 Barracuda 2LP Product Manual, Rev. D...
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Page 15: General Description
Barracuda 2LP Product Manual, Rev. D 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 disconnect/reconnect, multiple initiators, self-configuring host software, and automatic features that relieve the host from knowing the physical characteristics of the targets (logical block addressing is used). - Page 16 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.
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Page 17: 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 18: 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 ST32550 2,147.4 Mbytes... -
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 ST31250N, ST31250W, ST32550N, and ST32550W drives by enabling this feature with a jumper (see Section 10.1). - Page 20 Barracuda 2LP Product Manual, Rev. D...
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Page 21: 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 64,160 64,160 Bytes per surface, Mbytes unformatted... - Page 22 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.
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Page 23: 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 heads command) command... -
Page 24: General Performance Characteristics
SCSI interface data Asynchronous transfer rate * 5.0 Mbytes/sec** (maximum instantaneous) 10.0 Mbytes/sec*** Synchronous transfer rate fast 2.5 to 10 Mbytes/sec (ST31250N/ND and ST32550N/ND) Synchronous transfer rate wide 5.0 to 20 Mbytes/sec (ST31250W/WD/WC/DC and ST32550W/WD/WC/DC) Sector sizes Default 512-byte data blocks... -
Page 25: 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 26: 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 27: 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 28: 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 The target operates as a synchronized-spindle master control (not supported by the disc drive) The Pike 2 LSI on the master drive provides the reference signal (SSREF+). - Page 29 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 30 Barracuda 2LP Product Manual, Rev. D...
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Page 31: 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 Less than 10 errors in 10 bits transferred (using default settings) -
Page 32: Seek Errors
Barracuda 2LP Product Manual, Rev. D 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 10 physical seek operations. -
Page 33: 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 34: Figure 7. Wygx Temperature Measurement Locations
You should not operate the drive at the maximum case temperature for extended periods of time. Doing so will reduce product reliability. Air-flow cooling ST31250N and ST32550N single-ended drives MTBF 800k hours Card... -
Page 35: 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 30°C (86°F), plus a 5°C temperature rise in the test enclosure (35°C ambient local to the drive). -
Page 36: 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 37: 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 38: 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 39: 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 40: Preventive Maintenance
Barracuda 2LP Product Manual, Rev. D 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 41 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 42 Barracuda 2LP Product Manual, Rev. D...
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Page 43: 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. Values indicated apply at the drive’s power connector. -
Page 44: 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 45: 12V Current Profile
Barracuda 2LP Product Manual, Rev. D 7.2.3 12V current profile Figure 14 identifies the drive’s +12V current profile. The current during the various times is as shown. ST31250 Peak AC Nominal (average) curve Minimum AC T0 T1 T2 T3 T4 TIME (S) ST32550 2.85... -
Page 46: 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 47: 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 48: 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 b. -
Page 49: Mechanical Specifications
± ± 1.750 0.020 44.45 ± ± 0.181 0.015 4.59 ± ± 0.340 0.015 8.64 ± ± 0.190 0.010 4.83 0.015 0.381 ± ± 1.100 0.010 27.94 ± ± 4.100 0.010 104.14 Figure 15. ST31250N/ND and ST32550N/ND mounting configuration dimensions... -
Page 50: 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 51: 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 52: 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 53: 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 54 Barracuda 2LP Product Manual, Rev. D...
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Page 55: 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 56 Barracuda 2LP Product Manual, Rev. D...
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Page 57: Option/Configuration Headers
To configure N/ND drives, see Section 10.1.1. To configure W/WD drives, see Section 10.1.2. To configure WC/DC drives, refer to Section 10.1.3. 10.1.1 ST31250N/ND and ST32550N/ND configuration Figure 19 illustrates ST31250N/ND and ST32550N/ND jumper connectors. ST31250N and ST32550N J1 Connector Pin 1... - Page 58 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 59 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.
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Page 60: 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 2 Pin 1 Connector ST32550WD Pin 1 J1 Connector Pin 1 Pin 4 Pin 1... - Page 61 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 62 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 &...
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Page 63: 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) Pin 2 Pin 2 Pin 1... - Page 64 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. Example: If SCSI ID is equal to three (3) (3 x 10) +3 = 33...
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Page 65: 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. The system operation is described in Section 5.7. -
Page 66: Figure 23. St31250N/Nd And St32550N/Nd Configuration Select Header
Physical interface ST31250N/ND and ST32550N/ND drives Dimensions of the ST31250N/ND and ST32550N/ND J4 connector mounted on the main PCB to interconnect the drives are shown in Figure 23. It is a 20- pin, 10-position gold 2 mm header type connector. Only pins 5 and 6 are used for connecting the reference index signal cable, as shown in Figure 19. -
Page 67: Grounding
Barracuda 2LP Product Manual, Rev. D ST31250WC/DC and ST32550WC/DC drives Dimensions of the ST31250WC/DC and ST32550WC/DC J4 connector mounted on the main PCB to interconnect the drives are shown in Figure 25. It is a 20-pin, 10-position gold 2 mm header type connector. Only pins 6 and 10 are used for connecting the reference index signal cable, as shown in Figure 21. - Page 68 Barracuda 2LP Product Manual, Rev. D...
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Page 69: 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 70: Scsi Interface Commands Supported
Barracuda 2LP Product Manual, Rev. D 11.3 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. - Page 71 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 Translate Page Release Release (10)
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Page 72: Inquiry Data
Bytes 16 through 31 reflect the model of the drive (ST32550N/ND drive shown). ST31250N/ND codes: 53 54 33 31 32 35 30 4E 20 20 20 20 20 20 20 20 ST31250W/WD/WC/DC codes: 53 54 33 31 32 35 30 57 20 20 20 20 20 20 20 20 ST32550W/WD/WC/DC codes: 53 54 33 32 35 35 30 57 20 20 20 20 20 20 20 20 20 Note. -
Page 73: 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). Definitions: DEF = Default value. -
Page 74: 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 Mode Sense 9F 00 10 08 Data... -
Page 75: 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 Mode Sense AB 00 10 08 Data... -
Page 76: 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 77: Synchronous Data Transfer
Barracuda 2LP Product Manual, Rev. D 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 78: Dc Cable And Connector
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. The SCSI operational aspects of Seagate drive interfaces are provided in the SCSI-2 Interface Product Manual. ST31250N and... -
Page 79: 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 80: Physical Characteristics
All signals are common between SCSI devices. A maximum of 8 SCSI devices (including the host) may be daisy chained together when using a non-wide bus and ST31250N/ND or ST32550N/ND drives. A maximum of 16 SCSI devices (including the host) may be daisy chained together when using a wide bus and ST31250W/WD/ WC/DC or ST32550W/WD/WC/DC drives. -
Page 81: Connector Requirements
They are designed to be connected directly to a back panel . 11.7.1.2.3 General cable characteristics Note. Use only non-shielded cable connectors with ST31250N/ND and ST32550N/ND drives. Use a 50-conductor flat cable or 25-conductor twisted-pair cable. Use a minimum conductor size of 28 AWG to minimize noise effects. -
Page 82: Electrical Description
These signals must be terminated with 110 ohm active terminator circuits at each end of the total cable. Single-ended circuits use open collector or three-state drivers. ST31250N, ST31250W, ST32550N and ST32550W drives can be configured to provide the SCSI termination. -
Page 83: 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 84: 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 = –55 milliamps... - Page 85 [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. All single initiator/single target (non-daisy-chain) applications require you to terminate the initiator and drive.
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Page 86: 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 87: 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 88: 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) DB (1) -
Page 89: 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 Shrouded Post Header Header, Commercial AMPMODU 2mm... -
Page 90: 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) GROUND... -
Page 91: 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) DB (P1) -
Page 92: 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 93: 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 RESERVED/NC RESERVED/NC RESERVED/NC... -
Page 94: 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 RESERVED/NC RESERVED/NC RESERVED/NC... -
Page 95: 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 3.33 µs... - Page 96 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 0.10 µs...
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Page 97: Index
Barracuda 2LP Product Manual, Rev. D conducted noise immunity 34 Index 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 cooling, mechanical 42 current requirements 33 AC power requirements 33... - Page 98 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 J5, jumper connector 52 shock and vibration 37 jumper connectors...
- Page 99 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 physical wide differential interface 56...
- Page 100 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 brake 7 enabling and disabling 18 stopping with the Motor Start command 15...
- Page 101 Barracuda 2LP Product Manual, Rev. D...
- Page 102 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...
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