Recovering files from ext2/3

[jd1008]

I have been searching for ext2/3 design docs to see where the on-disk
superblock is located relative to starting sector of the partition, and how
many bytes it occucpies.

I was also looking for the formula that is used to compute the location
of all of the backup superblocks.

Thnaks for any pointers to online docs.


On 09/18/2014 11:37 AM, jd1008 wrote:
> Is there any other tool that can extract files from a partition that
> seems to have corrupted superblocks?
> I tried dumpe2fs, and fsck -b <blockNumber>
> to no avail. Tried all available block numbers that are listed
> when original mkfs was done, and it's output was saved.
>
> None of the blocks seem to work - all of them have invalid magic.
>
> When I run strings on the partition, I see many
> readily recognizable strings of files that I stored there.
>
> I understand that possibly the fs might be irretrievably corrupted,
> but wanted a last ditch input from other fs gurus.
>
>