I have an external 3.5" hard drive in a USB 2.0 enclosure that I have
been attaching to USB 1.1 ports on several different computers for over
a year without any problems. I have just recently installed a USB 2.0
PCI card in my computer for faster download speeds. However, when I
plug my external drive into one of the USB 2.0 ports the device seems
to install just fine, but when I go to access the drive, it shows up as
a different drive letter than it always has before and when I go to
access the drive I get the error message:

The file or directory is corrupted and unreadable.

However, if I reattach the external hard drive back to a USB 1.1 port
on the same computer, the old drive letter and all of my data
immediately show up. I have tried running a check disk on the drive
just to make sure there are no errors. I have also plugged different
devices into my new USB 2.0 PCI card and they have all worked properly.
I also tried just removing the USB 2.0 card from the device manager and
rediscovering it with no luck. The card was a cheaper ebay item that
came with only Win98 drivers and I am running Windows XP Professional.

I think I remember reading something a while back about a similar
problem that was fixed by removing some registry values associated with
the external hard drive, but I can no longer find these posts.

Any help would be most appreciated. Thanks,

-Andy