Bad sector on drive ...
Marc G. Fournier
scrappy at freebsd.org
Sat Feb 10 23:17:10 UTC 2007
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Didn't work, ended up newfs'ng the file system, since the data on the drive is
recreatable, and seems to have worked fine ...
the error I was getting was when fsck'ng, so suspect that a file got written
over top of the bad sector and was causng the problem ...
- --On Saturday, February 10, 2007 11:05:35 -0500 John Nielsen
<lists at jnielsen.net> wrote:
> On Saturday 10 February 2007 09:47, Marc G. Fournier wrote:
>> --On Saturday, February 10, 2007 01:00:21 -0600 Dan Nelson
>> <dnelson at allantgroup.com> wrote:
>> > In the last episode (Feb 10), Marc G. Fournier said:
>> >> Short of a reformat, any way of marking the following as bad? :(
>> >> Feb 10 02:27:20 ganymede kernel: ad4: FAILURE - READ_DMA
>> >> status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=176887263 Feb
>> >> 10 02:27:25 ganymede kernel: ad4: TIMEOUT - READ_DMA retrying (1 retry
>> >> left) LBA=176887324 Feb 10 02:27:30 ganymede kernel: ad4: TIMEOUT -
>> >> READ_DMA retrying (0 retries left) LBA=176887324 Feb 10 02:27:35
>> >> ganymede kernel: ad4: FAILURE - READ_DMA timed out LBA=176887324
>> > Try writing to the block causing the error, using dd and the seek=
>> > option; if the write succeeds, you're done (and the drive will have
>> > either reused the block or reassigned it to a spare). 176887324 If it
>> > doesn't succeed, copy what you can off the drive and toss it, since all
>> > its spares are used up.
>> > I think LBA numbers map directly to seek= values assuming you keep
>> > bs=512 and access /dev/ad4 . I'd try reading the bad block with dd to
>> > verify it's the right one before doing a write, though.
>> 'k, how do you use dd to write to a specific sector?
>> dd of=/dev/ad4 seek=176887324 bs=512 if=/dev/null
> dd of=/dev/ad4 seek=176887324 bs=512 count=1 if=/dev/zero
Marc G. Fournier Hub.Org Networking Services (http://www.hub.org)
Email . scrappy at hub.org MSN . scrappy at hub.org
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