Re: Bad sector on drive ...


If your going to continue to use the disk at least turn on S.M.A.R.T. in the
BIOS (if it's not
on already) and load one of the S.M.A.R.T.-aware tools in the ports
directories (like smartmontools)
to keep an eye on it. I still think though that it's just a matter of time
before you have more
problems. Disks are so cheap I can't understand why anyone would want to
try nursing
one along that's going bad these days.

Ted

----- Original Message -----
From: "Marc G. Fournier" <scrappy@xxxxxxxxxxx>
To: "John Nielsen" <lists@xxxxxxxxxxxx>; <freebsd-questions@xxxxxxxxxxx>
Cc: "Marc G. Fournier" <scrappy@xxxxxxxxxxx>; "Dan Nelson"
<dnelson@xxxxxxxxxxxxxxx>
Sent: Saturday, February 10, 2007 3:17 PM
Subject: Re: Bad sector on drive ...


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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@xxxxxxxxxxxx> wrote:

On Saturday 10 February 2007 09:47, Marc G. Fournier wrote:
--On Saturday, February 10, 2007 01:00:21 -0600 Dan Nelson

<dnelson@xxxxxxxxxxxxxxx> 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@xxxxxxx MSN . scrappy@xxxxxxx
Yahoo . yscrappy Skype: hub.org ICQ . 7615664
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