I'm sure one can be built, but I've seen drives
like these before (but for
the Macintosh).
I just saw a 3.5" USB drive this morning connected to a Dell. From the
looks of it, that is they way Dell was delivering the drive for that
computer (it was a tiny little tower like unit and had no floppy built
in).
So they are available for more than just the Mac. I think the one I
bought for my father's iMac (so he can transfer pics from his Mavica
camera) was not Mac specific and was supported by Windows and Linux
according to the box (but the drive sucks, its PAINFULLY slow to copy
data, far slower than the USB bus so the speed isn't killed by that...
IIRC, its a "SanDisk" brand drive, but I could be wrong).
-chris
<http://www.mythtech.net>