The tape in %LibraryType; %Library; at %MediaLocationType; %MediaLocationInfo; has been written to by another tape backup ...

The tape in %LibraryType; %Library; at %MediaLocationType; %MediaLocationInfo; has been written to by another tape backup application using an unsupported physical block size. DPM supports a physical block of 65536 bytes for writing and a physical block size ranging from 1024 bytes to 65536 bytes for reading. So DPM will not be able to read or overwrite the contents of this tape.