Re: [gentoo-user] Corrupt USB pen drive

[Hans-Werner Hilse]

Hi,

On Fri, 18 May 2007 12:50:07 +0100 Mick <michaelkintzios@×××××.com>
wrote:

> I am getting the same errors as before:
> ==========================================
> # mount -t vfat -o loop /tmp/r1 /mnt/sda1
> mount: wrong fs type, bad option, bad superblock on /dev/loop1,
>        missing codepage or other error
>        In some cases useful info is found in syslog - try
>        dmesg | tail  or so
> ==========================================
>
> No matter if I use vfat, msdos, or ntfs.  It seems to me that I need
> to reconstruct the hex of the partition table - but don't know how to
> do this and testdisk does not see the device to recover previous
> partition tables.

I'm pretty sure someone borked the first sectors of that stick. It
might have contained a partition table at some point in the past, and
the partition table might be gone now (HD mode). But there is also the
possibility that there wasn't a partition table but just a single
filesystem on the stick (superfloppy mode).

My suggestion is to take a hex editor and search for the start of a
partition. Most partition types are easily recognizable by some magic
bytes. It would, however, help a lot if you could tell what kind of
filesystem there was. If you found the start of the filesystem, just
use dd again and skip the bytes until the real start of the FS. You can
then mount the resulting file (w/o partitioning and such).

Did you try the recovery tools for the FS in question?

-hwh
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