On Mon, Dec 16, 2013 at 03:46:43PM +0100, Lars Noschinski wrote:
> I have got a hard disk which was damaged by a fall and would like to
> recover a few files from that. (There is a backup for most of the
> data, but a handful of recent files are missing. These are important
> enough to spend some time on them, but not for paying a professional
> data recovery service).
>
> Using GNU ddrescue I was able to read 99.8% of an ext3(or 4?)
> partition, so there's hope the data is still there. Unfortunately,
> some key parts of the file system seem to be damaged, so e2fsck fails:
>
> - ------------------------------
> % ddrescuelog -l- -b4096 sdd5.ddrescue.log > badblocks.sdd5.4096
> % e2fsck -b 20480000 -v -f -L badblocks.sdd5.4096 sdd5
> [...]
> Pass 1: Checking inodes, blocks, and sizes
> Block 1 in the primary group descriptors is on the bad block list
>
> If the block is really bad, the filesystem can not be fixed.
> You can remove this block from the bad block list and hope
> that the block is really OK. But there are no guarantees.
> - ------------------------------
> [at 20480000 there seems to be an intact superblock; got the number
> (and the block size) from 'mke2fs -n']
What I'd suggest doing is making a complete copy of the disk using
ddrescue to a known good disk, and then run e2fsck on that. It's
going to be simplest, most foolproof way to recover the data. Yes it
will take a while, but you can let it run overnight...
- Ted
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