Is it okay to disconnect or connect SCSI devices while powered on?
On older machines (without onboard SCSI controllers), it is never a good
idea to do this. You risk blowing a fuse on the CPU board, or part of
the SCSI hardware. On newer machines (sparcstations and later), many
people have done this regularly without problems. Halt the machine
(sync;L1-A), remove or add the device, then continue. However, it is
possible to blow the SCSI termination power fuse on the motherboard. If
your machine hangs immediately on powerup unless the SCSI bus is
externally terminated, this fuse may need to be replaced. Caveat Emptor.
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