Read-only paranoia during data recovery

[Kenneth Porter <shiva@xxxxxxxxxxxxxxx>]

I have a friend who needs to recover some data from a SCSI drive from a SCO 
system, and he wants to make sure nothing writes to the drive if he mounts 
it on his Linux system. I just want to verify that mounting it read-only is 
sufficient and won't attempt to write anything to it. (I recall in the old 
days when HD's had a write-protect jumper to protect it at the firmware 
level.) Are there other measures he should take?
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