○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ Barracuda 2LP Disc Drive ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ST31250N/ND, ST31250W/WD, ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ST31250WC/DC, ST32550N/ND, ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ Barracuda 2LP Disc Drive ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ST31250N/ND, ST31250W/WD, ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ST31250WC/DC, ST32550N/ND, ○ ○ ○ ○ ○ ○ ○ ○ ○
© 1996 Seagate Technology, Inc. All rights reserved Publication number: 83328930, Rev. D January 1996 Seagate® , Seagate Technology®, and the Seagate logo are registered trademarks of Seagate Technology, Inc. Barracuda™ is a trademark of 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.
Revision status summary sheet Revision Date Writer/Engineer A B 7/14/94 9/21/94 L. Newman/J. Olson L. Newman/J. Olson C 3/20/95 L. Newman/J. Olson D 1/9/96 L. Newman/J. Olson Sheets Affected All 36, 37, 43, 51, 57, 61, 64, 66 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, 80, 82 3, 18, 36, 39, 40, 41, 48, 50, 51, 53, 54, 57, 65, 72 Note.
Contents 1.0 Scope .............................................................................................................................. 1 2.0 Applicable standard and reference documentation ...................................................... 3 2.1 Standards ................................................................................................................. 3 2.2 Applicable reference documents ...............................................................................
vi Barracuda 2LP Product Manual, Rev. D 7.0 Physical/electrical specifications .................................................................................... 33 7.1 AC power requirements ............................................................................................ 33 7.2 DC power requirements ............................................................................................ 33 7.2.1 Conducted noise immunity ................................................................
Barracuda 2LP Product Manual, Rev. D vii 11.5 Synchronous data transfer ........................................................................................ 67 11.5.1 Synchronous data transfer periods supported .............................................. 67 11.5.2 REQ/ACK offset ............................................................................................ 67 11.6 DC cable and connector ........................................................................................... 68 11.
viii Barracuda 2LP Product Manual, Rev. D Figure 25. ST31250WC/DC and ST32550WC/DC configuration select header .......................... 57 Figure 26. ST31250N/ND and ST32550N/ND physical interface ................................................ 68 Figure 27. ST31250W/WD and ST32550W/WD physical interface ............................................. 69 Figure 28. ST31250WC/DC and ST32550WC/DC physical interface ......................................... 69 Figure 29.
Barracuda 2LP Product Manual, Rev. D 1.0 1 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. The SCSI-2 Interface Product Manual (part number 77738479) describes general SCSI interface characteristics of this and other families of Seagate drives. Figure 1.
2 Barracuda 2LP Product Manual, Rev.
Barracuda 2LP Product Manual, Rev. D 2.0 3 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 Barracuda disc drive, based on their final acceptability in the end-use product.
4 Barracuda 2LP Product Manual, Rev.
Barracuda 2LP Product Manual, Rev. D 3.0 5 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).
6 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. An automatic shipping lock prevents potential damage to the heads and discs. The shipping lock disengages when power is applied to the drive and the head load process begins.
Barracuda 2LP Product Manual, Rev. D 4.0 Standard features Barracuda 2LP drives have the following standard features: • • • • • • • • • • • • • • • • • • • • • • • • • • 4.1 Performance • • • • • • • 4.1.
8 4.2 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. ST31250 ST32550 Formatted 1,020.9 Mbytes 2,147.4 Mbytes Unformatted 1,205.3 Mbytes 2,541.3 Mbytes Users having the necessary equipment may modify the data block size before issuing a format command to obtain different formatted capacities.
Barracuda 2LP Product Manual, Rev. D 4.4 9 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. • If multiple devices are on the bus, set the drive’s SCSI ID to one that is not presently used by other devices on the bus.
10 Barracuda 2LP Product Manual, Rev.
Barracuda 2LP Product Manual, Rev. D 5.0 11 Performance characteristics This section provides performance-related characteristics and features of Barracuda 2LP drives. 5.1 Internal drive characteristics ST31250 1,205.3 ST32550 2,541.3 Read/write data heads, maximum (physical) 5 11 Bytes per track, average bytes 64,160 64,160 Bytes per surface, Mbytes unformatted 232.4 231.
12 Barracuda 2LP Product Manual, Rev. D during format, at Re-Zero command, at spindle-up, during read-error recovery, and during reassign-block functions). You can use the Re-Zero command to reset the thermal compensation timer to let the host know when the interruption for thermal compensation will occur. ASA II thermal calibration At power up and following a SCSI reset, the drive calibrates the heads using the SCSI Rezero Unit command before processing read and write commands.
Barracuda 2LP Product Manual, Rev. D 13 Start A Has 10 min.
14 5.3 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 Maximum 5.30 Mbytes/sec* 8.94 Mbytes/sec* Data transfer rate (< 1 track) Minimum Maximum 3.56 Mbytes/sec* 7.65 Mbytes/sec* SCSI interface data Asynchronous transfer rate * (maximum instantaneous) 5.0 Mbytes/sec** 10.0 Mbytes/sec*** Synchronous transfer rate fast (ST31250N/ND and ST32550N/ND) 2.
Barracuda 2LP Product Manual, Rev. D 5.4 15 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.
16 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” ratio specification given in Mode Select Disconnect/Reconnect parameters, page 02h (see the SCSI-2 Interface Product Manual ). 3.
Barracuda 2LP Product Manual, Rev. D 17 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. However, the drive does not overwrite data that has not yet been written to the disc.
18 Barracuda 2LP Product Manual, Rev. D Rotational position locking Note. Mode Select page 4, byte 17, bits 1 and 0. RPL Description 00b Spindle synchronization is disabled (default value) 01b The target operates as a synchronized-spindle slave 10b The target operates as a synchronized-spindle master 11b 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+).
Barracuda 2LP Product Manual, Rev. D 19 You may operate the drive with a rotational skew when synchronized. The rotational skew is applied in the retarded direction (lagging the synchronizedspindle master control). A rotational offset of up to 255/256 of a revolution lagging may be selected. Select the amount of offset by using the Mode Select command, Rigid Disc Drive Geometry page (page 04h), byte 18 (see the SCSI-2 Interface Product Manual ).
20 Barracuda 2LP Product Manual, Rev.
Barracuda 2LP Product Manual, Rev. D 6.0 21 Reliability specifications The following reliability specifications assume correct host and drive interface, including all interface timings, power supply voltages, and environmental requirements. 6.
22 6.1.3 Barracuda 2LP Product Manual, Rev. D 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 107 physical seek operations. After detecting an initial seek error, the drive automatically reseeks to the addressed track up to three times.
Barracuda 2LP Product Manual, Rev. D 23 Above unit Note. Air flows in the direction shown (back to front) or in reverse direction (front to back) Under unit Above unit Note. Air flows in the direction shown or in reverse direction (side to side) Figure 6.
24 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. Add 15°C to the 800k MTBF case temperatures to obtain the maximum temperature for each of the reference components.
Barracuda 2LP Product Manual, Rev. D 25 Air-flow cooling ST31250ND and ST32550ND differential drives Card Component HYHX HYHX HYHX HYHX ADC Detector Microprocessor Driver Reference MTBF 800k hours case temperature (°C) 1 2 3 4 49 60 55 57 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.
26 Barracuda 2LP Product Manual, Rev. D Air-flow cooling ST31250W and ST32550W wide single-ended drives Card Component JYHX JYHX JYHX JYHX ADC Detector Microprocessor Driver Reference MTBF 800k hours case temperature (°C) 1 2 3 4 49 60 55 57 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.
Barracuda 2LP Product Manual, Rev. D 27 Air-flow cooling ST31250WD and ST32550WD wide differential drives Card Component MTBF 800k hours case temperature (°C) Reference KYHX ADC 1 49 KYHX Detector 2 60 KYHX Microprocessor 3 55 KYHX Driver 4 57 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.
28 Barracuda 2LP Product Manual, Rev. D Air-flow cooling ST31250WC and ST32550WC wide single-ended SCA drives Card Component ZYHX ZYHX ZYHX ZYHX ADC Detector Microprocessor Driver Reference MTBF 800k hours case temperature (°C) 1 2 3 4 49 60 55 57 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.
Barracuda 2LP Product Manual, Rev. D 29 Air-flow cooling ST31250DC and ST32550DC wide differential SCA drives Card Component PYJX PYJX PYJX PYJX ADC Detector Microprocessor Driver Reference MTBF 800k hours case temperature (°C) 1 2 3 4 49 60 55 57 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.
30 6.2.3 Barracuda 2LP Product Manual, Rev. D 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. To achieve the 5-year service life, repairs must be performed only at a properly equipped and staffed service and repair facility.
Barracuda 2LP Product Manual, Rev. D 31 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. Do not hot-plug the first or last device on the SCSI bus (the SCSI bus termination must be external to the drive you are inserting or removing). a.
32 Barracuda 2LP Product Manual, Rev.
Barracuda 2LP Product Manual, Rev. D 7.0 33 Physical/electrical specifications This section provides information relating to the physical and electrical characteristics of Barracuda 2LP drives. 7.1 AC power requirements None. 7.2 DC power requirements The voltage and current requirements for a single drive are shown below. Values indicated apply at the drive’s power connector.
34 Barracuda 2LP Product Manual, Rev. D [5] See Section 7.2.1 “Conducted noise immunity.” Specified voltage tolerance includes ripple, noise, and transient response. [6] 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. These peaks should measure 5 msec duration or less. [7] Minimum current loading for each supply voltage is not less than 4% of the maximum operating current shown.
Barracuda 2LP Product Manual, Rev. D 12V current profile Figure 14 identifies the drive’s +12V current profile. The current during the various times is as shown. ST31250 Peak AC +12V CURRENT (A) 1.5 Nominal (average) curve 1.0 0.5 Minimum AC 0.0 T0 T1 T2 T3 T4 0 T5 5 T6 10 15 TIME (S) ST32550 3.0 2.85 2.5 Peak AC Nominal (average) curve +12V CURRENT (A) 7.2.3 35 2.0 1.9 1.5 Minimum AC 1.0 0.5 T2 T0 T5 T3 0.0 T1 0 5 T6 T4 10 15 20 25 30 TIME (S) Figure 14.
36 7.3 Barracuda 2LP Product Manual, Rev. D Heat/power dissipation The heat and power dissipation values for your drive are listed below.
Barracuda 2LP Product Manual, Rev. D 7.4.3 37 Effective altitude (sea level) a. Operating –1,000 to +10,000 feet (–305 to +3,048 meters) b. Non-operating –1,000 to +40,000 feet (–305 to +12,210 meters) 7.4.4 Shock and vibration Shock and vibration limits are measured directly on the drive’s chassis. Ensure that you use an enclosure that buffers and restricts the drive’s movements to meet the shock and vibration requirements listed below.
38 7.4.4.2 Barracuda 2LP Product Manual, Rev. D 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.
Barracuda 2LP Product Manual, Rev. D 7.6 39 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. Height Width Depth Weight 1.0 in 4.00 in 5.75 in 1.2 lb 25.4 mm 101.6 mm 146.
40 Barracuda 2LP Product Manual, Rev. D N P [1] A [3] R C M F D L G E Notes: .050 in. (1.27mm) minimum clearance [1] Mounting holes three on each side, 6-32 UNC. Max screw length into side of drive 0.15 in. (3.81 mm). Screw tightening torque 6.0 in-lb (.675 NM) max with minimum thread engagement of 0.12 in. (3.05 mm). T B [2] Mounting holes four on bottom, 6-32 UNC. Max screw length into bottom of drive 0.15 in. (3.81 mm). Screw tightening torque 6.0 in-lb (.
Barracuda 2LP Product Manual, Rev. D 41 N P [1] A [3] R C M F D L G E Notes: .050 in. (1.27mm) minimum clearance [1] Mounting holes three on each side, 6-32 UNC. Max screw length into side of drive 0.15 in. (3.81 mm). Screw tightening torque 6.0 in-lb (.675 NM) max with minimum thread engagement of 0.12 in. (3.05 mm). B [5] [5] Connector is centered on module ±0.020 in. [2] A B C K J [4] [2] Mounting holes four on bottom, 6-32 UNC. Max screw length into bottom of drive 0.15 in. (3.81 mm).
42 7.6.1 Barracuda 2LP Product Manual, Rev. D 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. Figure 18. Recommended mounting 7.6.
Barracuda 2LP Product Manual, Rev. D 8.0 43 Media characteristics This section provides information regarding the media used in Barracuda 2LP disc drives. 8.1 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 environmental protection.
44 Barracuda 2LP Product Manual, Rev.
Barracuda 2LP Product Manual, Rev. D 9.0 45 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 defectmanagement 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).
46 Barracuda 2LP Product Manual, Rev.
Barracuda 2LP Product Manual, Rev. D 10.0 47 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. 10.1 Drive ID/option select headers The headers described in this section enable you to configure the drive to meet specific functionality requirements. To configure N/ND drives, see Section 10.1.1.
48 ST31250N and ST32550N Barracuda 2LP Product Manual, Rev. D Block J1 Pins 1&2 Function Terminator power from the drive (drive supplies terminator power to its own terminators).
Barracuda 2LP Product Manual, Rev. D 49 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.
50 10.1.2 Barracuda 2LP Product Manual, Rev. D ST31250W/WD and ST32550W/WD configuration Figure 20 illustrates ST31250W/WD and ST32550W/WD option select jumper connectors. DC Power Connector ST31250W and ST32550W J1 Connector Pin 1 ST31250WD and ST32550WD J1 Connector Pin 2 Pin 1 Pin 1 Pin 4 Pin 3 Pin 1 SCSI I/O Connector J2 ST31250W and ST32550W J1 Pin 6 Pin 1 Pin 2 Term. power from drive (default) Term. power to SCSI bus Term. power from SCSI bus Term.
Barracuda 2LP Product Manual, Rev. D ST31250W and ST32550W Block J1 51 Pins 1&2 Function Terminator power from the drive (drive supplies terminator power to its own terminators).
52 Barracuda 2LP Product Manual, Rev. D 8 9 J5 Unit active LED pin (–) Enable SCSI terminator (ST31250W and ST32550W drives) 10 11 12 13– 20 1 & 2* 3 & 4* 5 & 6* 7 & 8* 9 & 10 Ground (+) 5 volts No connection Reserved SCSI ID bit 0 SCSI ID bit 1 SCSI ID bit 2 SCSI ID bit 3 Remote unit active LED connector Pin 9 = cathode (–), pin 10 = anode (+) 11 & 12 Spindle sync connector Pin 11 = SSREF (+), pin 12 = ground (–) *See Figure 20 to set the SCSI ID.
Barracuda 2LP Product Manual, Rev. D 10.1.3 53 ST31250WC/DC and ST32550WC/DC configuration Figure 21 illustrates ST31250WC/DC and ST32550WC/DC option select jumper connectors and SCSI ID.
54 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 automatically. Default is no jumper. Example: If SCSI ID is equal to three (3) (3 x 10) +3 = 33 The drive’s spindle motor starts in 33 seconds.
Barracuda 2LP Product Manual, Rev. D 10.2 55 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. 10.2.1 Electrical description The electrical interface consists of one digital TTL reference index signal and ground.
56 10.2.1.2 Barracuda 2LP Product Manual, Rev. D 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. A diode prevents current backfeed. 10.2.1.
Barracuda 2LP Product Manual, Rev. D 57 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. Pin 6 is SSREF+ and pin 10 is ground. .708 (18 mm) .079 (2 mm) .079 (2 mm) J4 .629 (16 mm) Figure 25.
58 Barracuda 2LP Product Manual, Rev.
Barracuda 2LP Product Manual, Rev. D 11.0 59 Interface requirements This section describes the Barracuda 2LP interface requirements. 11.1 General description The major portion of the interface requirements/implementation is described in the SCSI-2 Interface Product Manual (part number 77738479). 11.2 SCSI interface messages supported Table 1 lists the messages supported by the Barracuda SCSI-1 and SCSI2 modes. ASA I is Seagate’s first generation of advanced SCSI architecture firmware.
60 11.3 Barracuda 2LP Product Manual, Rev. D 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 command. Standard OEM drives are shipped set to operate in SCSI-2 mode. Table 2.
Barracuda 2LP Product Manual, Rev.
62 Barracuda 2LP Product Manual, Rev. D 11.3.1 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 Product Manual, Rev. D 11.3.2 63 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. Standard drives are shipped configured this way. CHG = Changeable bits; indicates if default value is changeable. Table 5.
64 Barracuda 2LP Product Manual, Rev. D Table 7.
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.
66 11.4 Barracuda 2LP Product Manual, Rev. D 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. Table 11.
Barracuda 2LP Product Manual, Rev. D 11.5 67 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. 11.5.1 Synchronous data transfer periods supported Table 12 lists the synchronous data transfer periods supported by the drives. Table 12.
68 11.6 Barracuda 2LP Product Manual, Rev. D DC cable and connector Note. This section applies only to N/ND/W/WD models. WC and DC models do not have a 4-pin power connector and do not use DC power cables. The drive receives DC power through a 4-pin connector mounted at the rear of the main PCB. Recommended part numbers of the mating connector are listed below, but equivalent parts may be used. Table 13.
Barracuda 2LP Product Manual, Rev. D DC Power Connector Pin 1 SCSI I/O Connector 69 ST31250W and ST32550W J1 Connector Pin 1 ST31250WD and ST32550WD J1 Connector J2 J5 J4 Figure 27. ST31250W/WD and ST32550W/WD physical interface SCSI I/O Connector (SCA) Pin 1 J2 J4 Figure 28.
70 11.7.1 Barracuda 2LP Product Manual, Rev. D Physical characteristics This section defines the connectors, cables, signals, and terminators needed to implement the SCSI interface. 11.7.1.1 Physical description You can daisy chain multiple SCSI devices on a common cable if each device has the same type of drivers and receivers (all single-ended or all differential). Devices having single-ended interface circuits cannot be on the same daisy chain with devices having a differential interface circuit.
Barracuda 2LP Product Manual, Rev. D 71 implies a cable characteristic impedance of 122 ohms. Differential I/O cable pin assignments for ST31250ND andST32550ND drives are shown in Table 18. Differential I/O cable pin assignments for ST31250WD andST32550WD drives are shown in Table 20. Differential I/O pin assignments for ST31250DC and ST32550DC drives are shown in Table 19. WC and DC model drives do not require an I/O cable. They are designed to be connected directly to a back panel . 11.7.1.2.
72 Barracuda 2LP Product Manual, Rev. D ST31250W/WD and ST32550W/WD drives Recommended mating wide cable connector part numbers: AMP 786096-7, female 68-pin AMP 1-480420-0, power connector 4 circuit housing BERG 69307-012 (12-position, 2 x 6, 2 mm receptacle housing) ST31250WC/DC and ST32550WC/DC drives No cable is required.
Barracuda 2LP Product Manual, Rev. D 73 Receiver characteristics Single-ended drives use an ANSI SCSI single-ended receiver with hysteresis gate or equivalent as a line receiver. Line Receiver Line Driver Transmitter (or transceiver) [4] +2.85V Receiver [4] +2.85V [1] 110 Ohm Flat Cable Pair [1] 110 Ohm [3] [2] [2] Figure 29. Single-ended transmitters and receivers Notes: [1] Part of active terminator circuits. Enable drive termination when it is first or last on the daisy chain.
74 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 Differential voltage = 1.
Barracuda 2LP Product Manual, Rev. D 75 [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.
76 Barracuda 2LP Product Manual, Rev. D 11.8 SCSI non-wide physical interface .60 (15.24) .42 Ref. (10.67) .20 Typ. (5.08) .065 x 45° Chamfer Typ. (1.65) .26 Typ. (6.60) Pin 1 .037 Ref. Typ. (.94) 3 2 4 1 CL .100 (2.54) .025 (.64) .335 ± .010 (8.50) +.001 .083 –.002 Dia. Sq. Contact (2.1) Trifurcated Pin (4 places) 50 Places .16 (4.06) .100 Typ. (2.54) "D" ± .010 .051 (1.30) .045 Min. Typ. (1.14) "C" ± .010 3 .834 ± .010 (21.18) .040 Ref. (1.02) "B" Ref. "A" ± .010 .370 ± .010 (9.
Barracuda 2LP Product Manual, Rev. D 77 Table 14. Single-ended cable pin assignments (non-shielded connector) for ST31250N and ST32550N drives Signal Pin number Signal Pin number −DB (0) 2 GROUND 28 −DB (1) 4 GROUND 30 −DB (2) 6 −ATN 32 −DB (3) 8 GROUND 34 −DB (4) 10 −BSY 36 −DB (5) 12 −ACK 38 −DB (6) 14 −RST 40 −DB (7) 16 −MSG 42 −DB (P) 18 −SEL 44 GROUND 20 −C/D 46 GROUND 22 −REQ 48 GROUND 24 −I/O 50 TERMPWR 26 Notes: 1.
78 Barracuda 2LP Product Manual, Rev. D Table 15.
Barracuda 2LP Product Manual, Rev. D 11.9 79 SCSI wide physical interface 1.368 (34.75) .767 (19.46) Position 1 68 Position SCSI Receptacle AMPLIMITE .050 Series .300 (7.62) Position 1 .740 (18.8) .870 (22.1) 12 Position Auxiliary Shrouded Post Header AMPMODU 2mm .315 (8.00) Position 1 4 Position Power Header, Commercial Mate-N-Lock .403 (10.24) .008 Typ (.20) .010 Typ (.25) Figure 32. Wide SCSI device connector .033 Typ (.
80 Barracuda 2LP Product Manual, Rev. D Table 16.
Barracuda 2LP Product Manual, Rev. D 81 Table 17.
82 11.10 Barracuda 2LP Product Manual, Rev. D SCSI single-connector attachment (SCA) physical interface * Side View 7.00 (.276) 1.52 (.060) 2.70 (.106) 12.70 (.500) 1.32 (.052) Section X–X 57.87 0 (2.278) –0.15 + .000 – .006 [ 0.15 M Y [ M –Y– Front View Pin 1 * 62.15 ± 0.15 (2.447) (± .005) 0.15 M Y M Housing X Insert cable connector here Top View 1.27 (.05) Typ PCB Contacts 0.50 (.020) 0.3 (.
Barracuda 2LP Product Manual, Rev. D 83 Table 18.
84 Barracuda 2LP Product Manual, Rev. D Table 19.
Barracuda 2LP Product Manual, Rev. D 85 Table 20. Disc drive SCSI timing Description Target select time (no arbitration) Target select time (with arbitration) Target select to command Target select to MSG out Identify MSG to command Command to status Command to data (para. in) Command to data (para.
86 Barracuda 2LP Product Manual, Rev. D Description Waveform symbol [1] Waveform table [1] Data in byte transfer (parameter) Data out byte transfer (parameter) Next data in byte access (parameter) Next data out byte access (parameter) Data in byte transfer (media) [2] Data out byte transfer (media) [2] Next data in byte access (media) [2] Next data out byte access (media) [2] MSG IN byte transfer T24 T25 T26 T27 T28 T29 T30 T31 T32 MSG OUT byte transfer STATUS byte transfer T33 T34 4.5-12 4.5-13 4.
Barracuda 2LP Product Manual, Rev.
88 Barracuda 2LP Product Manual, Rev.
Barracuda 2LP Product Manual, Rev.
90 I/O, cable requirements 70 SCSI drivers and receivers 7 single-ended I/O cable requirements 70 single-unit shipping pack kit 8 spare reallocation scheme 8 spindle brake 7 enabling and disabling 18 stopping with the Motor Start command 15 synchronization mode 18 start current 33 start/stop time 15 synchronized drive interconnect diagram 17 spindle operation 17 spindles interface 55 spindles interface, electrical description 55 synchronous data transfer periods supported 67 protocol 7 spindle 7 T temperat
Barracuda 2LP Product Manual, Rev.
92 Barracuda 2LP Product Manual, Rev. D Seagate Technology, Inc. 920 Disc Drive, Scotts Valley, California 95066-4544, USA Publication Number: 83328930, Rev.
