From owner-freebsd-hackers  Mon Mar 30 15:22:29 1998
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Date: Mon, 30 Mar 1998 16:22:15 -0700 (MST)
From: Tony Jones <tony@rtd.com>
Message-Id: <199803302322.QAA04585@seagull.rtd.com>
To: hackers@FreeBSD.ORG
Subject: help! scsi disk recovery question
Sender: owner-freebsd-hackers@FreeBSD.ORG
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Hi

I managed to (ahem) drop my system (just an inch - don't ask) while booting 
and it hung.

Rebooted and I started to get MEDIUM scsi errors reported by the NCR 
controller on scsi id 3 (a 1GB Seagate Hawk ST31051N)

Couldn't do anything to the disk, no dd of the device, no fsck with backup 
superblock, no newfs -N etc without getting the MEDIUM errors, a message about
being unable to read the primary partition table and finally an I/O error.

I also (ahem) don't have a recent backup of the data.

I took the disk into work, hooked it upto a Sparc and tried to see what
backup said about the drive. It complained it wasn't formatted and wouldn't
do much else. Grown flaw table was empty.

So, I hooked it to another PC with a 2940 and ran the scsi bios surface
scan. It spared out the first block and passed the rest.

Hooked it back upto the Sparc and it now saw a formatted but bogusly labelled
disk. Took a look at the grown flaw table and there is now one flaw at
	cyl 0 head 0 bfi 0

The Sparc read-only surface scan passed OK too. At this point I was amazed.

The disk is I believe "dangerously dedicated"? When I added it I just zeroed
the first few blocks of the disk with 'dd' and did a 'disklabel -rw sd3 auto'
(did it this way because I couldn't get FDISK to behave sensibly).

The disklabel has partitions=8 with just c and h partitions defined 
(h=c=whole disk).

So, I have two questions:
1) Can I recover the FS ? If so, what are the steps.

2) Could I have used FreeBSD tools to do what the Sparc and 2940 utilties
   did for me ? If so, which ones ? Yes I did RTFM, but nothing jumped out 
   at me.

Please CC me on a reply, as I only get the DIGEST.

Thanks

Tony

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