>Did this happen with any other make of drive or model of seagate drive?

We couldn't fit any other make or model. These were differential SCSI drives 
with special software and formatted to 180 byte sectors to work on a 
Burroughs mainframe. There was some failure mode in the controller that hung 
up the SCSI channel, which in turn caused the mainframe to slowly eat all 
its memory with disc buffers, making the mainframe grind to a slow halt.

Pulling the drive so the SCSI channel became operational allowed the buffers 
to clear and everything then ran sweet. We just got exchange drives for the 
faulty ones.

I suspect they had a batch of faulty differential interface chips that would 
die in a non-failsafe (interface wise that is) manner. We never spent any 
time attempting to work out what went wrong. 

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