Technical data

Adding Mass Storage Devices
6-28
Adding SCSI Devices
When adding a SCSI device, your computer configuration, SCSI adapter, and all
SCSI devices must work together for optimum performance. Use the following
guidelines to configure your computer and all SCSI devices.
•
Fast and wide SCSI supports up to 16 devices.
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Each SCSI device attached to the host adapter (including the SCSI adapter)
must have a unique SCSI ID. SCSI adapters usually default to SCSI ID 7.
Use SCSI ID 0 through 6 (narrow devices) and 0 through 15 (wide and ultra-
wide devices) for the remaining SCSI devices. Hard disk drives should be
configured to start with SCSI ID 0 and the lower ID numbers.
•
Narrow devices on a wide cable count as two SCSI IDs. For example, if the
narrow CD-ROM drive is SCSI ID 4, then SCSI ID 12 is no longer available.
The narrow CD-ROM device counts as two devices on a 16-bit wide data
path.
•
SCSI device drivers are required to operate your SCSI devices. These
device drivers have been factory installed for you.
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Both ends of the SCSI bus must be properly terminated. Your SCSI adapter
comes with its SCSI terminators enabled. This properly terminates the SCSI
adapter (the first device in the SCSI bus). The supplied SCSI ribbon cable is
equipped with an active SCSI terminator installed at the end of the cable (the
last device in the SCSI bus).
•
If your computer boots from a disk drive other than SCSI, make sure all
SCSI device drivers are installed on that disk drive. SCSI devices can be
used with an IDE drive only if the IDE drive is configured as drive C.
•
Make sure the proper BIOS Setup utility options are set for SCSI operation.
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Run the SCSI configuration utility to change host adapter settings to fit your
specific configuration.
Refer to the documentation supplied with your SCSI device for more information.