Bad sector on drive ...

Ted Mittelstaedt tedm at
Sun Feb 11 01:02:47 UTC 2007

no, not even with a reformat.

you MIGHT get something with the manufacturers "re-format" tools but keep in
that the way that these tools work is they simply wipe out the "grown
defects" list in
the disk drive, then re-test all of the defect areas that had been listed in
the grown defect
list, any that test out bad get added back into the list.

IDE/ATA/SATA drives all auto-remap bad sectors on the fly to a set of
"spare" sectors
in a special area of the disk.  What you have going on is a drive with an
increasing number
of bad sectors, to the point that it has used up all of it's spares and the
auto-remap can't
work anymore, so now the drive is starting to report the sectors bad.

What a wise person does in this scenario is go buy a new disk, and "dd" the
contents of the
old disk to the new disk.  What the unwise person does is continue to screw
around with
the old disk, trying various things, until one day the entire works crashes
and cannot be

Ted Mittelstaedt

----- Original Message ----- 
From: "Marc G. Fournier" <scrappy at>
To: <freebsd-questions at>
Sent: Friday, February 09, 2007 10:45 PM
Subject: Bad sector on drive ...

> Hash: SHA1
> 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
> left) LBA=176887324
> Feb 10 02:27:35 ganymede kernel: ad4: FAILURE - READ_DMA timed out
> - ----
> Marc G. Fournier           Hub.Org Networking Services
> Email . scrappy at                              MSN . scrappy at
> Yahoo . yscrappy               Skype:        ICQ . 7615664
> Version: GnuPG v1.4.5 (FreeBSD)
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> =lr6d
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