Re: repair partition: wrong size

[hugo vanwoerkom <hvw59601@care2.com>]

Bob McGowan wrote:
> 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.

Actually I was wrong: The sizes of sdb2+3 are correct, but what I cannot 
figure out is how the physical size of 487974 blocks for sdb2 is determined.
The partition has nothing on it that is useful. Just delete and reallocate?

Hugo