Seagate BARRACUDA 2LP

Seagate BARRACUDA 2LP - Disk Drives

Seagate BARRACUDA 2LP - Disk Drives

Disk Types ST31250N/ND, ST31250W/WD/WC/DC, ST32550N/ND and ST32550W/WD/WC/DC

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USA, Mexico, Latin America (408) 438-8771 England 44-62-847-8011 Germany 49-89-140-9331 Singapore 65-292-6973 Australia 61-2-756-2359 Canada (416) 856-5581 France 33-1-40-67-1034 Korea 82-2-556-7294

JUMPER setting for N / ND drives

Jumper Block J4

Use the J4 connector to set the SCSI ID. To change the SCSI ID, install jumpers on the appropriate pins as shown in below picture

For Synchronizing spindles, use pins 5 and 6 on the J4 connector to attach the spindle sync cable.
Use pins 3 (anode) and 4 (cathode) for a Remote LED connection.

Terminating the drive J1

ST31250N and ST32550N drives are terminated with permanently mounted IC active terminators. If you install one of these drives and it is not on the end of the SCSI bus, disable the terminators by removing the jumper from pin 5 and 6 of connector J1. If you install the drive on the end of the SCSI bus, enable termination by installing a jumper on pins 5 and 6 of connector J1.

Use active terminators when terminating the bus.

ST31250ND and ST32550ND drives do not have internal terminators or any other way of adding internal termination to the drive. You must provide external active termination (ANSI SCSI-Alternative 2) to these drives when termination is required.

Termination Power J1

There are four possible terminator power configurations for ST31250N and ST32550N drives. You will not normally need to change this option and can leave the drive configured as it was shipped from the factory.

ST31250ND and ST32550ND drives should be configured with a jumper connecting J1 pins 1 and 3 (and no jumper on J1 pins 2 and 4).

ST31250N and ST32550N

ST31250ND and ST32550ND

Other applicable jumper options J2

JUMPER setting for W / WD drives

Setting the SCSI ID jumpers J5

Use the J5 connector to set the SCSI ID. To change the SCSI ID, install jumpers on the appropriate pins as shown.

Terminating the drive J1

ST31250W and ST32550W drives are terminated with permanently mounted IC active terminators. If you install one of these drives and it is not on the end of the SCSI bus, disable the terminators by removing the jumper from pin 5 and 6 of connector J1. If you install the drive on the end of the SCSI bus, enable termination by installing a jumper on pins 5 and 6 of connector J1.

Use active terminators when terminating the bus.

ST31250WD and ST32550WD drives do not have internal terminators or any other way of adding internal termination to the drive. You must provide external active termination (ANSI SCSI-Alternative 2) to these drives when termination is required.

Termination Power J1

There are four possible terminator power configurations for ST31250W and ST32550W drives. You will not normally need to change this option and can leave the drive configured as it was shipped from the factory.

ST31250WD and ST32550WD drives should be configured with a jumper connecting J1 pins 1 and 3 (and no jumper on J1 pins 2 and 4).

ST31250N and ST32550N

ST31250ND and ST32550ND

For Synchronizing spindles use pins 11 and 12 on the J5 connector to attach the spindle sync cable.

Other applicable jumper options J2

JUMPER setting for WC / DC drives

Setting the SCSI ID jumpers

The SCSI ID for WC drives is normally set over the SCSI bus by the host system using connector contacts 39 (ID0), 40 (ID2), 79 (ID1) and 80 (ID3).

Terminating the drive

ST31250WC and ST32550WC drives do not have internal terminators or any other way of adding internal termination to the drive. You must provide single-ended external active termination (ANSI SCSI-2 Alternative 2).

Spindle synchronization for WC drives is normally handeled on the SCSI bus by the host system using connector contact 37 for the spindle sync reference signal. System designers may, optionally, install a spindle sync cable using pin 6 on the J4 connector to provide +SSREF.

Applicable jumper options

Barracuda 2LP Characteristics

Characteristics ST31250 ST32550 ------------------------------------------------------- Interface Fast SCSI-2 1 Fast SCSI-2 1 Capacity Unformatted 1.205.3 MB 2.541.3 MB Formatted 2 1.020.9 MB 2.147.4 MB Recording Cylinders (user) 3.711 3.510 Read/write data heads 5 11 Servo heads 1 1 Avg bytes/track 64.160 64.160 Seek time 3 Average read 8.0 ms 8.0 ms Average write 9.0 ms 9.0 ms Disk rotation RPM 7.200 7.200 Average latency 4.17 ms 4.17 ms Internal transfer rate 47.5 to 72.0 49.4 to 72.0 (Mbits/sec) Max sync. SCSI transfer rate N/ND 10 Mbytes/sec 10 Mbytes/sec W/WD/WC/DC 20 Mbytes/sec 20 Mbytes/sec Multi-segmented cache 512 Kbytes 512 Kbytes 1 Can also be operated according to SCSI-1 protocol 2 Standard factory units are formatted as follows : 512 data bytes per sector 9 spare sectors per cylinder 1 cylinder at the inner track reserved for spares 3 Not including on-board controller overhead. DC power requirements (± 5%) ------------------------------------------------------- Single-ended Differential +5V +12V +5V +12V Amps Maximum operating current 0.93 0.6 1.17 0.6 Max starting current Peak DC 0.93 1.35 1.00 1.35 Peak AC ---- 1.93 ---- 1.93 Delayed motor start (max) 0.88 0.12 0.92 0.12 Peak operating current Typ DC 0.91 0.57 1.13 0.57 Max DC 0.93 0.60 1.17 0.60 Max (peak) 1.00 1.56 1.95 1.56 Track following (DC) at OD 0.91 0.5 0.99 0.50 at ID 0.88 0.51 0.96 0.51 Read track OD DC 0.96 0.53 1.35 0.53 AC 1.03 0.73 1.95 0.73 Seeking Typical DC 0.89 0.78 0.99 0.78 Maximum DC 0.92 0.82 1.10 0.82 Maximum (peak) AC 0.95 1.60 1.67 1.60

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