On Thu, Jan 17, 2008 at 04:31:48PM -0800, Bryan Henderson wrote:
> But I heard some years ago from a disk drive engineer that that is a myth
> just like the rotational energy thing. I added that to the discussion,
> but admitted that I haven't actually seen a disk drive write a partial
> sector.
Well, it would be impossible or at least very hard to see that in
practice, right? My understanding is that drives do sector-level
checksums, so if there was a partially written sector, the checksum
would be bogus and the drive would return an error when you tried to
read from it.
> Ted brought up the separate issue of the host sending garbage to the disk
> device because its own power is failing at the same time, which makes the
> integrity at the disk level moot (or even undesirable, as you'd rather
> write a bad sector than a good one with the wrong data).
Yep, exactly. It would be interesting to see if this happens on
modern hardware; all of the evidence I've had for this is years old at
this point.
- Ted
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