There are
currently 5 DAT formats (DDS, DDS-1, DDS-2, DDS-3,
and DDS-4)
and all are backward compatible.
But, can a drive from manufacturer "A" read a DDS-1 tape written on
manufacturer "B's" drive? It's been my understanding that sometimes
even
different model drives from the same manufacturer can't read the same tape.
You're supposed to be OK if you didn't used compression,
or also OK if you used software compression (assuming you
can find a program on the target platform that understands
the compression).
It's when you use hardware compression that you may be screwed.
-dq