Scan exceeds 100%?

Hi

Apologies if this is covered somewhere but I can't find it.

I'm currently trying to run a deep scan on a WD 1Tb drive. The scan progress as I write is at 985% and rising and the disk "read" light has stopped flashing. Have tried three times now and if I cancel it shows "incomplete result"

Windows XP SP3, scanning external USB drive WD10JMVW

Is this normal behaviour or does it reflect a faulty install of the software or a problem with the drive?

Thanks

It probably represents the work entailed in scanning a very large USB-attached disk. How long has it been running? Let Stage 1 complete and then cancel the job. The full results will be shown.

OK thanks, max about 15 mins before I lost my nerve.

Will try again and go make coffee ;-)