tape_34xx.e96040 <bus ID of the tape device>: The tape unit cannot process the tape format
Explanation
Either the tape unit is not able to read the format ID mark, or the
specified format is not supported by the tape unit.
User response
If you do not need the data recorded on the current tape, use a different
tape or write a new format ID mark at the beginning of the tape. Be aware
that writing a new ID mark leads to a loss of all data that has been
recorded on the tape. If you need the data on the current tape, use a tape
unit that supports the tape format.