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20 Barracuda 4 Installation Guide, Rev. E
SCSI ID jumpers
Each device on the SCSI chain must have a unique
SCSI ID. The host system’s SCSI controller usually
uses the highest-numbered ID available; therefore the
lower-numbered SCSI IDs are normally used for other
SCSI devices such as this Barracuda disc drive.
Most Barracuda disc drives are factory set with the
SCSI ID set at 0. To change the SCSI ID, refer to the
appropriate drive section for your model.
Note. Most SCSI controllers (host adapters) allow you
to skip a SCSI ID. For example, you can have ID0,
ID1, and ID3 (skipping ID2). Other controllers do
not allow this; refer to your system or controller
user’s manual for details about its requirements
for proper SCSI device installation.
After completing the installation process, if the drive’s
LED does not show on/off activity when the host is
trying to communicate with the drive, a duplicate SCSI
ID may be the problem. If this is the case, change the
ID so that each device on the SCSI chain has its own
unique ID. Also check your system or controller user’s
manual to ensure that you have not violated its SCSI ID
numbering recommendations.