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From: cohn@ucbvax.UUCP
Newsgroups: comp.sys.mac
Subject: SCSI HD Errors
Message-ID: <18095@ucbvax.BERKELEY.EDU>
Date: Tue, 31-Mar-87 14:32:21 EST
Article-I.D.: ucbvax.18095
Posted: Tue Mar 31 14:32:21 1987
Date-Received: Thu, 2-Apr-87 05:58:17 EST
Organization: University of California at Berkeley
Lines: 18
Keywords: SCSI, Hard Disk, Peripheral Land

I just experienced a strange sort of disk crash recently and I wondered
if anyone else out there has experienced the problem.  I was developing
some software that bombed (of course) and somehow triggered the writing
of bad data to my Master DIrectoy Block.  Yikes!  Well, as the confident,
optimistic person that I was, I hadn't backed up my 30Meg SCSI HD from
Peripheral Land.  Apparently, not only was my master directory screwed,
but so was one of the 640 cylinders!  Question:  How can a software
crash cause a whole cylinder to physically go bad?  I called Peripheral
Land, and was greeted by a lot of "sorries" and "there's-nothing-we-
can-do's" so you might as well "reinitialize your disk."  Yikes!  

Is there any good reconstruction software for SCSI's available besides
Scavenger and Disk First Aid?  Both of those programs couldn't stand the
heat.  If you have had a similar problem with hard disk crashes, I'd
be interested.

Ted Cohn
ARPA:  cohn@cory.berkeley.edu