I have a PC with several drives in it.

Every now and then one or more of my disk drives just disappears and I
cannot see in in Windows Explorer and in Device Manager, and under Disk
Management in Storage Manager....

I first thought it was a problem with one of the drives which is a Maxtor
drive but now since a Seagate drive is also disappearing I am thinking it
might be a Windows XP or hardware problem.

Any suggestions on how to trouble shoot this problem, or suggestions on what
this could be?

Thanks for your help.

Tmeb