Have 3 external USB drives by different manufacturers. Have recently had reason to move them around among 3 different servers, all running Windows Server 2003. Fortunately all these external drives have been backed up, because when I remove one of these drives off ServerA, plug it into ServerB, the external drive that was already plugged into ServerB goes south on me. Says it's "unallocated" and needs to be formatted. Tried the same thing moving one from ServerB to ServerC. The external drive already plugged into ServerC did the same thing. Uh, I'm not moving them anymore, ever. But what would cause this? I used the "Safely Remove Hardware" icon that's in the taskbar of each server. I turned the drive off before I removed it and plugged it into the server. But all data is now apparently toast. I'm really really glad that the data held on these drives are old out-of-date files that we don't use anymore but just need some where to store them. I also plugged one into an XP SP2 workstation, and it also indicated that it needed to be formatted. Hmmm.