> There's no way I known.
> The label is inside the head volume ..
>
http://www.bacula.org/manuals/en/developers/developers/Overall_Storage_Format.html

I believe this is difficult to impossible to do nondestructively if
the tape is compressed (which it should be). The reason is even if you
could rewrite the first block on the tape with the new header it may
not take up the exact same amount of tape (with compression) as it
previously did and thus trash your first block of data. If it took up
less tape this would also be destructive.

Your best bet is to wait till your volume purges and rename it then.

John

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