Probably not.

zzzzara@my-deja.com wrote

> I've had a strange problem for a while, with Windows resetting
> occasionally without warning. Most of the time it works fine.

You dont normally get that with a bad hard drive.

> I ran chkdsk /4, and got stuck at 11% of stage 4.
> It does the same if I boot from my spare hard drive,
> so I guess it can't be a software problem.

Yes, but its also unlikely to be a bad hard drive too.

> The seagate diagnostic tools (run from a boot CD) hang
> as soon as they start the quick or the full disc check.

> Seems fairly clear there's a hardware problem.

Yes.

> Before I get a replacement drive...

Its unlikely to be a bad hard drive if you get the
same problem with two different hard drives.

> is there a way to check that it is the drive at fault
> and not the controller/motherboard? Some more
> sophisticated diagnostic software, perhaps?

Yes, check the event log and see what Win says about
why you are getting reboots if you are running 2K or XP.

> (Ideally I'd test the drive in another PC,
> but I don't really have access to one.)

OK, post the Everest SMART data for the drives.
http://www.majorgeeks.com/download.php?det=4181

> The drive is a SATA Barracuda 7200.8 and the motherboard Asus A8V.