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From: cramer@kontron.UUCP (Clayton Cramer)
Newsgroups: net.micro.pc,net.periphs
Subject: Strange Noises From My Hard Disk
Message-ID: <750@kontron.UUCP>
Date: Tue, 29-Apr-86 14:53:50 EDT
Article-I.D.: kontron.750
Posted: Tue Apr 29 14:53:50 1986
Date-Received: Fri, 2-May-86 08:07:57 EDT
Distribution: net
Organization: Kontron Electronics, Mt. View, CA
Lines: 13
Xref: watmath net.micro.pc:7990 net.periphs:1050

Help!  I have a 10 Mb CMI hard disk on my PC, mounted in an external 
cabinet.  I also have a DMA controller chip that I don't trust, but
because it is soldered in, I haven't replaced it.  Anyway, I'm 
starting to have problems with my disk drive apparently "disappearing"
from view of PC-DOS.  When I power the system off and then back on,
the problem goes away.  Finally, last night I using the hard disk and
there was a loud "thunk" noise three times in rapid succession.  It
was loud enough that I jumped back in fear of something attacking me
out of the drive.  (Yes, I know that's not going to happen, but it 
was THAT 6oud.)  After powering everything off and on again, the disk
was still working, and none of my data was lost.  Any idea what the
"thunk" noise is, and could my flaky DMA controller chip be the
guilty party?