USB Drive Problem in XP

I've been having a strange problem with a new 16gb USB drive. If I
plug it into a certain USB port on my PC, it reads it fine. If I plug
it into another (right next to it), it detects the drive but shows it
in RAW format and asks to format it. I have the same issue at work
with it - on one PC (also running XP) both USB ports on it detect the
drive in RAW format. I take it over to another PC and plug it in, and
it detects it.

What gives? Is this a driver issue or is something wrong with the
drive? I did have to format it using KillDisk for Windows when I got
it, I don't know if that had anything to do with it.

Thanks.