I configured a PnP Library to an external USB drive. I use the library as target for a single Storage Policy secondary copy. When running the first Aux Copy, it stops after half an hour or 20 GB of data (more or less). Error: media in the drive is already assigned. Please insert a new media into the libraryPnP.
Also a "Failed to mount media"-error and something about Operation: Read OML (disk is being labeled automatically).
What can cause this behaviour of the Aux Copy, initially everything going well and then suddelny failing?