Hi Jerome,
in one of your other posts, "Tar and cpio" you describe in question no. 2 how you make two tar-sessios on a tape: The answer I then thought of writing was that after you have listed the first tar session on the no-rewind device, you are actually at the beginning of session no. 2. Therefore - as you also assume in that thread - after an additional "fsf 1" you are at the end of the tape. Important to keep in mind if you list a file you would like to restore: listing it brings you past the tar session in which it is. Hope it helps.
reagards,
John K.
it would be nice if you always got a second chance