I had an extra SATA drive, so I bought an external drive enclosure for it.
I use it to back up files. But when I do anything that requires a lot of
I/O activity, like running MSBackup on 35 gigs of files or Disk
Defragmenter, the entire computer locks up completely. It just freezes in
the middle of whatever it was doing, and I have to hit the reset button.

Any idea what might be causing this? Thanks.