Specifications

Appendix A: Connecting SCSI Drives 81
Connecting SCSI Drives
To connect an external SCSI drive:
1 Turn off power to both the computer and the
hard drive.
2 Attach a SCSI cable from the SCSI port of the
hard drive to the SCSI port of the SCSI HBA card
or computer.
3 Secure the cable’s connectors to the hard drive
and computer. Loose cables can cause data loss.
4 Connect additional drives by daisy-chaining
from one drive to another. Keep cable lengths to
a minimum (see Table 1).
5 Verify that the last SCSI device connected is
properly terminated. (See “SCSI Termination”
on page 81.)
6 Attach power cables to the hard drives.
SCSI Termination
Your computer’s SCSI chain must be properly
terminated or your system will not function cor-
rectly. Only the last device on the chain should
be terminated using the termination type rec-
ommended by the hard drive manufacturer.
The drive should use either an external termina-
tor plug or have its internal terminators en-
abled. If you are using a terminator plug, Digide-
sign recommends that you purchase and use an
active terminator.
Connecting a SCSI cable to a SCSI HBA card
to SCSI hard drive
SCSI accelerator card
Connecting an external SCSI hard drive
Do not enable internal termination and in-
stall an external terminator plug on the
same drive. This will cause SCSI errors. See
your hard drive’s documentation for infor-
mation regarding which type of termination
it uses.
to SCSI accelerator card