FTDs just behave like tapes. The main differences to their predecessor, the 
'optical' device media are
  - FTD media can handle individual save sets
  - FTD media can only read OR write

Besides that, the FTD media will only be overwritten when
  - All save sets on the media have expired (are in the state 'recyclable') so 
the media became 'recyclable' too     AND
  - NW needs a media from the same pool on this SN    OR
  - The administrator relabels the media

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