This Lexar has quickly changed the way I work: I now keep nearly all my files on this drive and use it on three computers-- a WIn XP (USB 1.1), Win 2000 (USB 1.1), and Mac PowerBook (USB 2.0.) It works flawlessly on all of them, and never causes any problems.The two small caveats are these: I can't find any easy way to add a password to the disk, which leaves me a bit uncomfortable-- I've already misplaced the drive a few times. I've found it every time, but still.... And on a Mac PowerBook, the shape of the drive means you cannot plug in another USB device (like a mouse) and use the drive. The ports are quite close togther, and the drive's slightly bulbous shape means there's no room for two devices side-by-side. Some other drives have a bit less of a bulge in the middle.In all, it's a great, inexpensive little product that does exactly what it says it does.