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Barracuda 36ES Installation Guide
Model ST336737LW/LC, ST318437LW/LC, ST318417N/W SCSI interface disc drive
Publication Number: 75789522, Rev. A, December 2000
Handling precautions/electrostatic discharge protection
•Disc drives are fragile. Do not drop or jar the drive and handle the drive only by the edges or frame.
•Drive electronics are extremely sensitive to static electricity. Keep the drive in its antistatic container until you are ready to install it. Wear a wrist strap and cable connected to ground. Discharge static from all items near or that will contact the drive. Never use an ohmmeter on any circuit boards.
•Turn off the power to the host system during installation.
•Always use
•Use caution when troubleshooting a unit that has voltages present.
•Do not disassemble the drive; doing so voids the warranty.
•Return the entire drive for depot service if any part is defective.
•Do not apply pressure or attach labels to circuit board or drive top.
Electromagnetic compliance
See Safety and Regulatory Agency Specifications, p/n 75789512.
Drive characteristics
| ST336737 | ST318437 | ST318417 | |||
| LW/LC |
| LW/LC | N/W |
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Formatted capacity | 36.954 Gbytes | 18.400 Gbytes | 18.400 Gbytes | |||
Total # of data blocks | 72,176,566 | 35,937,500 | 35,937,500 | |||
| (44D53B5h) | (2245CDBh) | (2245CDBh) | |||
Cylinders (user accessible) 29,850 |
| 29,850 |
| 29,850 |
| |
Heads (user accessible) | 4 |
| 2 |
| 2 |
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Disc rotation +/- 5% | 7,200 rpm | 7,200 rpm | 7,200 rpm | |||
Operating voltages | +5V | +12V | +5V | +12V | +5V | +12V |
Typical operating |
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current (amps) | 0.83 | 0.57 | 0.78 | 0.30 | 0.78 | 0.30 |
What you need
•Phillips screwdriver and four
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•An unused drive power connector (not applicable to LC models)
To operate at LVD transfer rates, you may also need an
Multimode interface
This drive can operate in
You can configure the drive to switch between SE and LVD modes automat- ically or force it to operate in SE mode only. To configure this option, see 2 Note. To operate in LVD mode, all devices on the same bus (cable) must
be running in LVD mode. If you add any SE device to the bus, all devices on that bus operate in SE mode.
Note. Some LVD host adapters provide an LVD connector and an SE con- nector on the same host adapter to allow you to run SE and LVD drives concurrently at their maximum capabilities. Check your SCSI host adapter documentation. See 4
Caution. Do not mix LVD drives on the same bus (cable) with high voltage differential (HVD)
N and W model drives are not multimode devices. They are
Installation instructions
1. Set the SCSI ID
Determine which SCSI IDs are already being used in the system and then assign this disc drive a SCSI ID that isn’t already being used. Use the J6 connector located on the front of the drive to set the SCSI ID (see Figure 1).
•Most Barracuda 36ES drives are factory set with the SCSI ID set at 0. If this is the only SCSI drive in your system and there are no other SCSI devices on the bus (cable), you can leave this drive’s SCSI ID set to 0 and proceed to the next step.
•The host system’s SCSI controller usually uses SCSI ID 7.
•If you have an LW model drive, the ID may be set using either J6 or J5 (located on the rear of the drive).
•If you have an LC model drive, the host normally sets the ID over the I/O interface, so this step may be skipped.
•Some systems provide a cable designed to connect to the J5 jumper block on the drive to remotely set the ID. You can connect this cable to J5 and use the
JumperFrontPlug |
| Pin1 | ConnectorSCSI68PinI/O |
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| DCDrivePowerJ1RearHDA |
(enlargdto | Reserved | A3A2A1A0 | J1Pin10+5VGround | 4PPinJ5(default)13P2P 1PPCBA | ||||
showdtail)e | ||||||||
Drive |
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1 | EE |
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DS |
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2 | J6 LR | (default) | 2 |
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0 | 3 |
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5 |
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6 |
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7 |
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8 |
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90 |
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1 |
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4 |
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SCSIID=15 |
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| SCSIID=15 | 3 | 2 | 1 | 0 | |
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| notused |
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| A | AAA |
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Figure 1. Setting the SCSI ID
2. Configure termination
If you are installing the drive in a system that has other SCSI devices installed, terminate only the end devices on the SCSI bus (cable).
N and W models have
LW and LC models do not have internal terminators or any other way of adding internal termination on the drive. You must provide external termina- tion when termination is required. This is normally done by adding an inline terminator on the end of the cable. See Figure 4 for an illustration showing a system configuration that uses an external terminator.
•Use active (ANSI
•Use
•The host adapter is normally on the other end of the bus and internally terminated. You can configure your bus with another device on the other end if you remove termination from the host adapter.
3. Configure terminator power
Terminators have to get power from some source. The default configuration results in the drive not supplying termination power to the bus. You should normally leave this drive set at this default unless your host system requires the drive to supply termination power to the bus. To configure this drive to supply termination power to the bus, place a jumper on J2 pins 1 and 2 as shown in Figure 2.
•Host systems designed to use LC drives normally provide termination power from the host adapter or other source. For this reason, LC model drives cannot be configured to provide termination power to the bus.