We recently purchased USB 3 hard drives for use as a backup device for an SBS 2003 server, which connects to USB 2 ports.
There are 5 drives that are replaced daily. However, when the drive is removed, then reconnected is does not regain its assigned drive. In this case F drive. When this happens, we need to access the Disk Management tool and manually assign the F drive letter to the hard drive (each time). If we do not do this, the SBS backup tool does not see the F drive which result in the destination drive being unavailable, and the backup fails.