Date: Sat, 10 Feb 2007 10:47:17 -0400 From: "Marc G. Fournier" <scrappy@freebsd.org> To: Dan Nelson <dnelson@allantgroup.com> Cc: freebsd-questions@freebsd.org Subject: Re: Bad sector on drive ... Message-ID: <0121884CDA5AC278CD6A7D52@ganymede.hub.org> In-Reply-To: <20070210070020.GP37689@dan.emsphone.com> References: <5D4377994F77F6A6C215D198@ganymede.hub.org> <20070210070020.GP37689@dan.emsphone.com>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - --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 - ---- Marc G. Fournier Hub.Org Networking Services (http://www.hub.org) Email . scrappy@hub.org MSN . scrappy@hub.org Yahoo . yscrappy Skype: hub.org ICQ . 7615664 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (FreeBSD) iD8DBQFFzdr14QvfyHIvDvMRAtdXAKC4Fjjd7tn8tjtqyQzO10NlYYBXTACgmYaa bTZ9nTHTrd6HzUJXWm1ND6I= =YBMq -----END PGP SIGNATURE-----
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