From owner-freebsd-hackers  Thu Jul 15 19: 7:36 1999
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To: joe@pavilion.net, niall@pobox.com
Cc: hackers@FreeBSD.ORG
Subject: re: HELP!! Slice info disappeared
From: Kazukiyo UEDA <kueda@jupiter.qse.tohoku.ac.jp>
In-Reply-To: Your message of "Fri, 9 Jul 1999 10:01:16 +0100"
	<19990709100116.G50525@pavilion.net>
References: <19990709100116.G50525@pavilion.net>
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Hello Niall and Josef,

Thanks for your great help.  

Finally I get all data on the disk back after the struggle on the
weekend :) I run the program you sent me, but I got nothing from it.
I guess the reason as follows:

(1) The program fetches each chunks of 16 blocks from the disk and
check if they are superblocks.

(2) My disk is sliced into 3 parts.  The fist one is for MS-DOS (FAT
format), and the rest of them are FFS.  It's highly possible that the
offset block of the beginning of FFS slice is not a multiple of 16.

(3) So I did:

    # for i in 0 1 2 3 ... 15; do
    # ./findsb /dev/wd2 $[ (estimated end of block for FAT slice)*512 + $i*512 ]
    # done

After I got the info from the superblocks, getting back data was easy.
Again, thanks much for your great help.  You saved a lot of my time to
reconstruct the data from scratch.

Sincerely yours,

--
Kazukiyo Ueda

From: Josef Karthauser <joe@pavilion.net>
Subject: re: HELP!! Slice info disappeared
Date: Fri, 9 Jul 1999 10:01:16 +0100

> Hi Kazukiyo,
> 
> This is certainly possible.  I've enclosed a hack from Niall Smart that should
> generated enough information to for you to reconstruct it.   I'm working on a
> general solution to this for inclusion FreeBSD as shipped, but it's at home
> and I'm at work, that said it's Niall's basic code saved my harddisk a few weeks
> ago :)
> 
> Joe
> 


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