On Fri, 9 Dec 2005, Levi Bard wrote:
> > Can you access the disk using the alternate partition tables at blocks
> > (8192*n + 1) IIRC?
>
> How do I go about doing that? Is there a flag I can pass to fdisk?
e2fsck has such an option:
-b superblock
Instead of using the normal superblock, use an alternative
superblock specified by superblock. This option is normally
used when the primary superblock has been corrupted.
But in order to e2fsck the image, you have to have attached it to a device
already, and to attach it to a device, you have to know where the partition
starts. A bit of a Catch-22.
I suppose you could:
dd bs=512 if=/dev/hda conv=noerror | gzip -9 > hda.img.gz
look at the partitions of a good drive with dd and od to see what the
beginning of a partition looks like
gzip -d < hda.img.gz | od -t x1 --address-radix=d | grep <that string>
(unless you know about where they begin, in which case you can speed things
up dramatically by supplying an appropriate "skip=" option to dd)
That should tell you where partitions begin.
gzip -d < hda.img.gz | dd bs=1k skip=<partition beginning> count=<partition
length> | file -
Just to make sure you're right... that should take only a few seconds. If
you're right,
gzip -d < hda.img.gz | dd bs=1k skip=<partition beginning> count=<partition
length> > hdan.img
Then proceed with the losetup. Don't forget to fsck with the "-b" option.
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