tape

[ammad shah]

Dear all,
 
i am trying to backup on tape drive (lto3), but when i save it , it always overwrite on previous files. even though i am writing every time a new file. 
 
#tar -cvf /dev/st0  backup-01-09.tar.gz
#tar -tvf /dev/st0
backup-01-09.tar.gz
#tar -czvf /dev/st0 backup-02-09.tar.gz
#tar -tvf /dev/st0
backup-02-09.tar.gz
 
Why ? 
 
and how do i know space left on tape drive before backup.  i am using single cartridge IBM LTO 3 tape drive.
 
thanks.
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