Date: Sun, 15 Feb 2004 18:45:43 -0800 From: "Evan Dower" <evantd@hotmail.com> To: freebsd-questions@freebsd.org Subject: Recovering Damaged Partition Table Message-ID: <BAY8-F41pN6PQKspUH000045446@hotmail.com>
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So, the other day I was ripping some CDs...
Upon restart, there was a message that ad0 had an unrecoverable error (media
changed). It's a hard disk. I didn't notice any gnomes breaking into my
computer and changing it on me. No matter. It won't boot. I installed
FreeBSD on an empty partition of another disk, which is how I got to where I
am now. Naturally, I have no backups.
My plan is to reconstruct the partition table and then all should be fine.
I've determined that my files seem to be in tact using 'strings /dev/ad0 |
less'. It even looks like part of the partition table remains.
% fdisk ad0
******* Working on device /dev/ad0 *******
parameters extracted from in-core disklabel are:
cylinders=59598 heads=16 sectors/track=63 (1008 blks/cyl)
Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=59598 heads=16 sectors/track=63 (1008 blks/cyl)
fdisk: invalid fdisk partition table found
Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
<UNUSED>
The data for partition 2 is:
<UNUSED>
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
start 63, size 60074721 (29333 Meg), flag 80 (active)
beg: cyl 0/ head 1/ sector 1;
end: cyl 205/ head 15/ sector 63
First, are there any tools that can look at the disk and guess what the
partition table should look like? Failing that, I figure I can take a look
at the disk where I think the partition edges were and look for some sort of
cues to tell me what the partition boundaries ought to be. Can you all help
me with this / guide me through it?
Thanks very much for your time,
--
Evan Dower
Undergraduate, Computer Science
University of Washington
Public key: http://students.washington.edu/evantd/pgp-pub-key.txt
Key fingerprint = D321 FA24 4BDA F82D 53A9 5B27 7D15 5A4F 033F 887D
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