I ordered two of these, one for my genealogical research and photo files, one for my son's music and photo files at school (he plays in a band and was concerned about losing music files stored on his laptop harddrive). We both found this to be a great value and, although we have no reason to worry, we recommend that you use this as a stationary storage device, not to tote around. We've heard nightmare stories about important media being lost due to banging around a traveling WD. Electronics are delicate.
Great price, easy to use and, so far, so good! No glitches. One computer has a Windows Vista Home Premium OS, one has a Windows XP SP-2 OS. Works fine on both, although I think the backup on the Vista is better. Just my opinion.