Re: [PLUG] corrupted partition table on CF card

["W. Chris Shank" <chris.shank@acetechgroup.com>]

i catually do have another 64M CF card. everything worked except the mount
at the end. any other ideas?

> On Sun, Jul 07, 2002 at 05:34:59PM -0600, W. Chris Shank wrote:
>> oh shit, it worked this time! i swear i tried this yesterday and it
>> didn't work. look like dd successfully pulled all data from card. at
>> least i think it did. the card is 64M total, but it wasn't nearly
>> full. would that matter? should the dd snapshot be 64M? Now that I
>> have this data down, how can i recover the image files?
>> 
>> dd if=/dev/sdb of=cflash_out
>> 125184+0 records in
>> 125184+0 records out
> 
> well, iirc by default dd does reads in blocks of 512 bytes, so 
> 512 * 125184 is somewhere in the ballpark of 64MB, so looks like you
> have the whole card.  as for retrieving the data, what i'd do first is
> make a couple copies of this image file so you can feel a little more
> comfortable mucking around with it.  
> 
> the first thing i'd try is taking a copy and putting it somewhere safe
> :)  next i'd try setting it up on your loopback device (your kernel
> needs to support loopback), and see if you can just give it a new
> partition table. or, even better, do you have a working CF card?  if
> so, try just copying the partition table from one to the other.  the
> partion table is the first 512 bytes of the device (someone please
> correct me if i'm wrong!:), so you could do something like:
> 
> - put in a working cf card of the same size
> # dd if=/dev/sdb of=ptable.img bs=512 count=1
> # losetup /dev/loop0 cflash_out
> # dd if=ptable.img of=/dev/loop0 bs=512 ocunt=1
> - knock on wood
> # mount /dev/loop0 /mnt
> 
> if that doesn't work, try using losetup on the image like above and
> then just running fdisk on it, and set the partition table to how you
> think it should have been.
> 
> on a related note, a while back i accidentally deleted some important
> stuff on a fat32 partition that i'd really really like to get back.  as
> soon as it happened i unmounted the partition, and mirrored it
> somewhere safe with dd--anyone know of some good (ideally free)
> software i could use to drag the deleted data up from the murky depths
> of this hard disk image?  thanks :)
> 
> --sean
> 
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