Date: Sat, 10 Feb 2007 19:17:09 -0400 From: "Marc G. Fournier" <scrappy@freebsd.org> To: John Nielsen <lists@jnielsen.net>, freebsd-questions@freebsd.org Cc: "Marc G. Fournier" <scrappy@freebsd.org>, Dan Nelson <dnelson@allantgroup.com> Subject: Re: Bad sector on drive ... Message-ID: <1CEB5BF1B5111F6CAA3843A9@ganymede.hub.org> In-Reply-To: <200702101105.36039.lists@jnielsen.net> References: <5D4377994F77F6A6C215D198@ganymede.hub.org> <20070210070020.GP37689@dan.emsphone.com> <0121884CDA5AC278CD6A7D52@ganymede.hub.org> <200702101105.36039.lists@jnielsen.net>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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@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@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 > - ---- 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) iD8DBQFFzlJ14QvfyHIvDvMRAicNAJ9Fvx3B7p8ibsne3lV+HSd6rnkLEwCgmKBz IsS5cm2DUlwcC3fKbnyiT9c= =G+Wn -----END PGP SIGNATURE-----
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