On UNIX/Linux, you use the option indirectly by talking to the appropriate 
device name.
  For exampe /dev/rmt/0cbn    (not sure about the absolute path) uses 
compression
  while          /dev/rmt/0bn      would not.

On Windows, there is no such option by default - you usually would need to 
modify the driver.
However, some of the tape vendor utilities may allow you to set this directly 
or indirectly by issueing the SCSI MODE SELECT command.

BTW - for our LTO5 tapes we have capacities varying from from in our 
environment we have capacities from 1.3TB to 3.3TB. This is mixed data 
However, the tapes for the NW metadata (index and bootstrap backups) are 
keeping 3.8 to 4.0 TB.

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