Re: repair partition: wrong size

[Bob McGowan <bob_mcgowan@symantec.com>]

On 08/05/2010 07:07 AM, hugo vanwoerkom wrote:
> Hi,
> 
> I just noticed that the partition sizes on my usb disk are wrong.
> 
> debian:/# fsck -f /dev/sdb2
> fsck 1.41.3 (12-Oct-2008)
> e2fsck 1.41.3 (12-Oct-2008)
> The filesystem size (according to the superblock) is 1953905 blocks
> The physical size of the device is 487974 blocks
> Either the superblock or the partition table is likely to be corrupt!
> Abort<y>? yes
> 
> These are the sizes reported:
> 
> debian:/# sfdisk -l /dev/sdb
> 
> Disk /dev/sdb: 9729 cylinders, 255 heads, 63 sectors/track
> Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
> 
>    Device Boot Start     End   #cyls    #blocks   Id  System
> /dev/sdb1   *      0+    972     973-   7815591   83  Linux
> /dev/sdb2        973    1215     243    1951897+  83  Linux
> /dev/sdb3       1216    2918    1703   13679347+  83  Linux
> /dev/sdb4       2919    9728    6810   54701325    5  Extended
> /dev/sdb5       2919+   3891     973-   7815591   83  Linux
> /dev/sdb6       3892+   4864     973-   7815591   83  Linux
> /dev/sdb7       4865+   9728    4864-  39070048+  83  Linux
> 
> 
> sdb2 an sdb3 are wrong, they both ought to be 7815591.
> 
> How does one repair that?
> 
> Hugo
> 

Have you tried the '-b' option, to use an alternate superblock?

If the primary has been corrupted, using an alternate would/should fix
the issue, assuming the alternate is OK.

See the man page for e2fsck for a way to figure out where the alternates
were created.

-- 
Bob McGowan