Backup many tar files in the same tape

hi all
i have many small geoframe projects of size,,around 3,,,5 GB but the lower tape contain 24 GB availble space..
===> I WOULD BACKUP ALL THE SMALL PROJECTS UNDER THE SAME TAPE...
for example i have three project (proj1,proj2,proj3)
the problem is when i write these line for backuo these projects together then the tape is rewind even i use 0n option!!!!! :
$ mt -f /dev/rmt/0 rewind
$tar cvf /dev/rmt/0n proj1
$mt -f /dev/rmt/0 rewind
$mt /dev/rmt/0n fsf 1
$tar /dev/rmt/0n proj2
$mt -f /dev/rmt/0 rewind
$mt /dev/rmt/0n fsf 2
$tar /dev/rmt/0n proj3
===> logically, i should find the 3 project inside the tape (proj1,proj2 and proj3),,,but i always find the latest single project when i use the tar command for list the content of the tape:
$tar tvf /dev/rmt/0n
proj3
if someone know what's wrong whith this operation please don't hesitate to give me the solution
thanks in advance

Before running the tar, run 'mt -f <device> status' You should see that for later runs, your tape is not on file 0/block 0
Also, you're doing it the complex way. Don't rewind/forward between each one. Just always use the no-rewind device and leave the tape in place.
mt -f <tape> rewind
tar cf <tape> proj1
mt -f <tape> status # verify not at beginning of tape
tar cf <tape> proj2
[etc]
If you use the rewind device, then when you run 'status', you'll see the tape is at the beginning.
Try again, but this time show the status just before running the final tar to tape, and show the status just before gathering the contents of the tape.
Darren

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