Last Updated on December 2, 2019 by Christopher G Mendla
If you use USB hard drives in rotation for backups you can run into a problem in that hard drive. letter assignments are not sticky.
In one case I ran into an additional problem in that the existing configuration mapped a network drive as D. When you added a USBdrive, it took the first available drive letter which happened to be D. This caused conflicts.
A solution was to use USBDLM (USBDrive letter management). This runs as a service and precludes newly connected USBdrives from taking the mapped network drives.