
- end of tape detection during write, allow multiple volumes.
  (probleem met multi volume backup (tar) )
- start_tape sometimes rewinds completely instead of partial
- conner format tape (one off somewhere) support.
- implement MTOFFL rewind, reset, new cartridge ?
- implement file-marks and mt `seek' commands.
- stop tape on timer/signal initiated by isr.
  (handle segment out of reach when tape in motion).
- start_tape: do not search id of bad sectors.


