Bad Blocks... Should I RMA?
m.seaman at infracaninophile.co.uk
Mon Nov 16 06:56:15 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
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.
[*] If the error messages have disappeared since, then this has probably
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
Kent, CT11 9PW
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