Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!pyramid!voder!apple!tecot
From: tecot@apple.UUCP (Ed Tecot)
Newsgroups: comp.sys.mac
Subject: Re: What to do when your HD disappears
Message-ID: <6854@apple.UUCP>
Date: Sun, 29-Nov-87 23:22:21 EST
Article-I.D.: apple.6854
Posted: Sun Nov 29 23:22:21 1987
Date-Received: Wed, 2-Dec-87 22:51:07 EST
References: <3611@uwmcsd1.UUCP> <2167@unc.cs.unc.edu>
Reply-To: tecot@apple.UUCP (Ed Tecot)
Organization: Apple Computer Inc., Cupertino, USA
Lines: 22
Keywords: Mac II hard disk crash

In article <2167@unc.cs.unc.edu> creech@unc.UUCP (Jeff Creech) writes:
>I want to *why* it is that some of the Mac II's are losing their SCSI drivers
>several times a week.  This not what we are paid five grand for!
>
>Does Apple have an *answer* to this problem?

Here is my assessment:
When an application crashes, it may end up executing random memory.  We have
determined that a particular trap, SetOSDefault, has a high probability of
being executed when an application goes astray.  This trap will cause your
startup disk to attempt to boot from a different (nonexeistent) partition.
The fix is to reset your parameter RAM, as far as I know, the SCSI driver
is not touched.  We have a fix for this problem (although it would be nice
if applications didn't have these bugs).

To determine if you are hitting this, the next time your hard disk refuses
to boot, boot off of a floppy, and open the control panel with
command-option-shift depressed to reset the parameter RAM.  Then attempt to
reboot.  If this fails, tell me.  If this succeeds, post the programs,
DAs, INITs, etc. that you use, so that we have some hope of finding the
culprit.

						_emt