Recovering files from ext2/3

[jd1008]

On 09/18/2014 01:23 PM, Tom Horsley wrote:
> On Thu, 18 Sep 2014 12:45:37 -0600
> jd1008 wrote:
>
>> I was also looking for the formula that is used to compute the location
>> of all of the backup superblocks.
> OK, I found my notes from the last time I did this the paragraph about
> units may be the important part :-).
>
> I was able to mount the busted partition (read only, of course) using an
> alternate superblock like so:
>
> mount -o ro,sb=3276800 /dev/sdXX /mountpoint
>
> Where you find a number like 3276800 by doing:
>
> dumpe2fs /dev/sdXX | grep -i superblock
>
> Natually the units are all wrong, you need to multiply the numbers
> that show up in the dumpe2fs listing by 4 to pass them to the
> sb= on the mount command. (This may be the important missing info :-).
>
> I used one of the superblocks in the middle of the list to get it
> to mount, and was able to copy off some of the files.
>
dumpe2fs also fails for same reasons stated.
I have already tried all the superblocks. All of them
have bad magic.
So, first I wlll try the debugfs suggested by Nathan Schwartz
and I will try Rick Steven's suggestion.

Thanx,

JD