Bad Blocks... Should I RMA?
Matthew Seaman
m.seaman at infracaninophile.co.uk
Mon Nov 16 06:41:12 UTC 2009
Lowell Gilbert wrote:
> "Ronald F. Guilmette" <rfg at tristatelogic.com> writes:
>
>> Nov 15 15:24:17 coredump kernel: ad4: FAILURE - READ_DMA status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=256230591
>
> This is *not* necessarily a big deal, despite what your other response
> told you. Errors on reads do not mean that your drive's bad-sector
> table is full; only errors on write indicate that. If you can try
> manufacturer's drive diagnostics, do that. If you can't, then it's
> harder to fix things up, but not impossible; write back if you
> really can't use a low-level diag.
Yes -- this is correct. It's possible for a disk to be unable to read a sector,
but rewriting the sector would either succeed and leave the sector fully working
again, or cause it to be remapped in which case the disk will subsequently perform
perfectly well[*].
Beyond running the manufacturers diagnostics, as the OP has said he has nothing particularly valuable on the drive, it might be worth running a few passes of dban
or similar on the disk --- this will overwrite every part of the platter and
should make it abundantly clear if there is a real and persistent problem. If
you can't afford to scrub the disk, then just keep it under observation: if the
problems recur within a few weeks then yes, definitely RMA that drive.
Cheers,
Matthew
[*] If the error messages have disappeared since, then this has probably
already happened.
--
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
Kent, CT11 9PW
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