Manipulation DAT tapes on linux

[JM]

Hi,

	I have a 4mm DDS-150 tape in linux and I was wondering if someone can answer 
this questions.
	
	is it possible to extract selected file or files from an archive without 
extracting all the data from the tape?

	is it possible to add a directory with files to a tape archive? (tape has an 
existing data on it)

	is it possible to get the tape usage?	

	what i usually do is tar -cvf /dev/st0 ..... .... ....

	

TIA,
	

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