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From: Bob McGowan on 5 Aug 2010 14:00
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


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From: hugo vanwoerkom on 6 Aug 2010 11:30
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


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