Configuring The Drive - Seagate ST5660N Installation Manual

ST5660N Installation Guide, Rev A

Configuring the drive

Select the appropriate drive features by installing or removing
jumpers on the drive circuit board shown in Figure 1 on page 4
and according to the instructions in Figure 2 on page 5. Refer to
your host adapter documentation for terminator specifications
and configuration instructions.
1. Setting the SCSI ID. Each device on the bus must have a
unique SCSI ID. If you are installing only one drive, use SCSI
ID 0 (no jumper installed). If you install a second drive, you
can use any ID (SCSI ID 1 is recommended). SCSI ID 7 is
usually reserved for the SCSI host adapter. To set the
SCSI ID, install jumpers on options jumper block J8 as shown
in Figure 2 on page 5, and leave all pins of J5 open. For special
applications, you can use J5 to set the SCSI ID (see Figure 3
on page 6); in these cases, leave the SCSI ID pins of J8 open.
For details, refer to the Seagate ST5660N Product Manual ,
publication number 36245-00x .)
2. Terminating resistors. The drive supports Fast SCSI transfer
rates and contains 110 ohm resistors for active termination.
(The drive uses single-ended drivers and receivers.) These
resistors can be enabled or disabled as required.
If you are installing only one drive, and your system contains
only one initiator (for example, a stand-alone host adapter),
enable active termination by leaving pins 19 and 20 of jumper
block J8 open.
If you are installing multiple drives in a daisy-chain, disable
active termination on all drives not at a cable end. Do this for
each intermediate ST5660N drive by installing a jumper on
pins 19 and 20 and on pins 23 and 24 of J8.
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