The first thing I'd do would be to check for an updated BIOS for the problem
system.

Another thing to try is to disconnect the drive. Then boot into Safe mode
and remove the drives and then try clean booting before adding the drive
back to the system.

How to Perform Clean-Boot Troubleshooting for Windows 98
http://support.microsoft.com/?kbid=192926

This may also be helpful:

How to Troubleshoot Hardware Device Drivers
http://support.microsoft.com/?kbid=296060

PattyL

"StanB" wrote in message
oups.com...
I'm a software developer working to create a driver stack for a
USB/SATA interface based on the UMSS sample. I have a problem on some
systems where, after a Device Manager refresh, a physical drive is
shown with two drive letters in Explorer. Files created on one of the
drive letters are also visible on the other drive letter.

Does anyone know whats causing this or (better) how to fix it.

TIA.