On a Workgroup Server 8550/132 when large drives (2 GB and 4 GB), and fast drives (7200 RPM) are used on both the internal and external SCSI channel, as in a dual-drive configuration, all of the drives may not mount on the desktop from a cold startup. This only occurs with large, and fast drives from a cold restart. This is because the time to ready status is initiated from the drive after the system looks for it.
If this symptom occurs in other situations, its root cause is different.
Workaround
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First, use the Startup Disk control panel and deselect all volumes. This delays the system enough for a drive to mount.
Second, select the Restart command from the Special menu. Since the drive will already be spinning, it will respond appropriately to the restarting of the server and mount.