Re: drive error seek complete (84), bad crc (51)

[Rick Stevens <rstevens vitalstream com>]

Fred Grant wrote:
> I'm getting the above errors on a brand new Maxtor ATA drive.  Google
> suggestions are replace cable or use hdparm to shut off dma.  It boots
> the drive OK.  Any thoughts?

Those are suspicious and are usually indicative of a drive that's
dying.  However, it could be caused by cables or DMA.

Turning off DMA is fairly simple:

	hdparm -d0 /dev/whatever

Turning it back on is also simple:

	hdparm -d1 /dev/whatever

As to cabling, well, you know what's involved there.

You might want to download a diagnostic (one may have come with the
drive) and do a non-destructive test on the drive.  It may be bad
timing marks on the servo platter that's causing the issue, since the
errors are seek complete errors (I'd ignore the CRC issues until the
seeks work reliably--if you can't get to the cylinders, the CRC is
irrelevant).
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