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44 Barracuda 2LP Installation Guide, Rev. E
WC/DC drives
Setting the SCSI ID jumpers
The SCSI ID for WC drives is normally set over the SCSI
bus by the host system using connector contacts 39
(ID0), 40 (ID2), 79 (ID1), and 80 (ID3). Systems design-
ers may, optionally, install a remote operator panel con-
nection to set the SCSI ID. Figure 15b illustrates the SCSI
ID pins used for this purpose.
Terminating the drive
ST31250WC and ST32550WC drives do not have inter-
nal terminators or any other way of adding internal
termination to the drive. You must provide single-ended
external active termination (ANSI SCSI-2 Alternative 2)
to these drives when termination is required.
Synchronizing spindles
Spindle synchronization for WC drives is normally handled
on the SCSI bus by the host system using connector
contact 37 for the spindle sync reference signal. System
designers may, optionally, install a spindle sync cable
using pin 6 on the J4 connector to provide +SSREF (see
Figure 15b).