[YLUG] recovering partition table

[Patrick Dupre]

On Sat, 25 Jul 2009, Roger Leigh wrote:

> On Sat, Jul 25, 2009 at 02:20:09PM +0100, Patrick Dupre wrote:
>> Thank for the advice.
>>
>> I guess that the partitions are still OK.
>> I run testdisk
>> et fdisk gives:
>> /dev/sdd1               1         305     2449881   82  Linux swap /
>> Solaris
>> /dev/sdd2             306        9726    75674182+   f  W95 Ext'd (LBA)
>> /dev/sdd5             306         732     3429846   83  Linux
>> /dev/sdd6             733        1733     8040501   83  Linux
>> /dev/sdd7            1734        2342     4891761   83  Linux
>> /dev/sdd8            2343        2953     4907826   83  Linux
>> /dev/sdd9            2954        3318     2931831   83  Linux
>> /dev/sdd10           3319        3499     1453851   83  Linux
>> /dev/sdd11           3500        5900    19286001   83  Linux
>> /dev/sdd12           5901        6901     8040501   83  Linux
>> /dev/sdd13           6902        8102     9647001   83  Linux
>> /dev/sdd14           8103        9726    13044748+  83  Linux
>
> This is meaningless.  That could be correct or incorrect and we
> could not tell.  It's just a bunch of numbers.  It might be
> technically correct, but if it changed from your previous setup,
> then you will have lost your old partitions.

This should be correct. I did not change any number.
As I said it has been recovered by testdisk.

It is not easy to explain what I have done, but my understanding is that
anaconda deleted the partition table which then has been recovered by
testdisk.

>
> How are your "guessing" that they are OK?  What have you done to
> verify the fact?
>
>> fsck -r /dev/sdd5 gives:
>>
>> fsck 1.41.4 (27-Jan-2009)
>> e2fsck 1.41.4 (27-Jan-2009)
>> fsck.ext2: Superblock invalid, trying backup blocks...
>
> So /dev/sda5 doesn't contain a valid filesystem (no superblock).  There
> are two possibilities:
>
> 1) Your filesystem is badly corrupted
> 2) Your partition table is incorrect
>
>> So, I think that the best would be to make a dd if=/dev/sdd5 of=/tmp/sdd5
>> (and so on for each partitions), but I failed in dd because I guess
>> that I am do giving the right count !
>
> *NO* *NO* If your partition table is screwed you cannot copy the partitions,
> only the whole disk.  The point being, you're not backing up the original
> partition, just a random chunk of your disc.
>
>> Than I could do either a mount of the file (if it recognize the type)
>> or a fsck of the file ?
>
> You haven't told us what you did to break it, nor done what I asked in
> my other mail (file -s), so advising you further is not possible until
> you do so.
>
>
> Regards,
> Roger
>
>

-- 
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  Patrick DUPRÉ                      |   |
  Department of Chemistry            |   |    Phone: (44)-(0)-1904-434384
  The University of York             |   |    Fax:   (44)-(0)-1904-432516
  Heslington                         |   |
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