Strange hard drive problem

[Ken_B]

Under XP, I just ran Disk Defragmenter on my C: drive, a 120-gig Seagate,
with no problem.

But when I tried to defrag my primary slave drive, a 40-gig Western Digital,
I got a
message that the drive might be corrupted and that I should run CHKDSK
(checkdisk).

But checkdisk says the drive is not available because the file system on it
is RAW!

Yet the drive works fine, no problems.

I scanned the drive with WD's diagnostic program and it found no problems.

What could be causing this?

 

[Ken_B]

I transferred the drive to another computer running Win98_SE and was able to
run Scandisk....found a lot of severely damaged files, mostly in Recycled. I
couldn't delete that folder under Dos or Windows. So I'm just going to
reformat.