Date: Sat, 10 Feb 2007 11:05:35 -0500 From: John Nielsen <lists@jnielsen.net> To: freebsd-questions@freebsd.org Cc: Dan Nelson <dnelson@allantgroup.com>, "Marc G. Fournier" <scrappy@freebsd.org> Subject: Re: Bad sector on drive ... Message-ID: <200702101105.36039.lists@jnielsen.net> In-Reply-To: <0121884CDA5AC278CD6A7D52@ganymede.hub.org> References: <5D4377994F77F6A6C215D198@ganymede.hub.org> <20070210070020.GP37689@dan.emsphone.com> <0121884CDA5AC278CD6A7D52@ganymede.hub.org>
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On Saturday 10 February 2007 09:47, Marc G. Fournier wrote: > --On Saturday, February 10, 2007 01:00:21 -0600 Dan Nelson > > <dnelson@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 JN
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