info-mac@utcsrgv.UUCP (info-mac) (04/27/84)
Date: Wed, 25 Apr 84 14:11:34 cst
From: Ed Dean <uw-beaver!dean@rice.ARPA>
To: PATTERMANN@SUMEX-AIM.ARPA, info-mac@SUMEX-AIM.ARPA
Subject: unreadable disks
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Date: 20 Apr 1984 11:19-EST
From: Jim Walkup <jww@rice.ARPA>
Subject: unreadable disks
To: info-mac@SUMEX-AIM.ARPA
Message-Id: <451329581/jww@Dione>
Resent-Date: Fri 20 Apr 84 12:40:00-PST
Resent-From: Ed Pattermann <PATTERMANN@SUMEX-AIM.ARPA>
Resent-To: info-mac:;@DIONE
I have a disk with some data on it which I would like to keep which the Mac
refuses to read. The symptoms are:
1) the machine refuses to boot off of the disk
2) if it is booted from another disk, that disk ejected, and the bad
disk inserted, the system bombs
3) in both cases, a "severe system error" "ID = 02" is given and the
machine halts
The disk worked quite well for a day and a half. At that time, it had
the entire system folder on it. I deleted the "system" and
the "imagewriter" files from the system folder with no
apparent harm. I then copied the "system" file back in
successfully. I tried to copy the "imagewriter" file back
onto the disk, but got a "disk full--use another disk"
message. I tried this copy a second time and seemed to
succeed.
If anyone knows how to retrieve the data, I would like to know.
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A flyer from the Rice micro-support group suggests the following:
While holding down both the command and option keys, insert
the disk to be booted. Keep both keys depressed until the disk is
finished being read.
I tried it with a disk I had a problem with and it seemed to
work.