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Date:      Wed, 18 Nov 2009 17:53:12 -0800
From:      "Ronald F. Guilmette" <rfg@tristatelogic.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: Bad Blocks... Should I RMA? 
Message-ID:  <80459.1258595592@tristatelogic.com>
In-Reply-To: <44my2n45zd.fsf@be-well.ilk.org> 

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In message <44my2n45zd.fsf@be-well.ilk.org>, 
Lowell Gilbert <freebsd-questions-local@be-well.ilk.org> wrote:

>"Ronald F. Guilmette" <rfg@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.


Well, OK, so I ran the "long test" in Seagate Seatools.

Result:  It noticed exactly and only _one_ bad sector, which I of course
told it to repair/remap.

The kicker:  The specific bad secror was somewhat near to the one that
was indicated in the FreeBSD /var/log/messages errors, _however_ it was
most definitely a different LBA sector #.

So at that point I was kinda worried, cuz now I was looking at two bad
sectors.

Still, I didn't really want to have to RMA a drive that's less than one
year old, so I used dd and copied /dev/zero to the whole drive.  Then
I used dd again to copy the wole drive to /dev/null.  No errors at all
in either case.

Then I ran the Seatools "long" diagnostic again.  Result:  Zero errors.

So I decided to keep the drive.  Yes, there's some bad sectors, but I
think they are all locked out now.

I'm hoping this isn't a mistake.  Only time will tell.


Regards,
rfg



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