DDS4 Drive can't read DDS3 tapes.

SONY TSL-S11000 external tape drive can not read a simple tar file
from a DDS3 tape.
It can only read it if "tar" command included the "-b 1" option to
write the file to the DDS3 tape.

tar -b 1 cvf /dev/rmt/1 file

Then it can rea it:
tar -tvf /dev/rmt/0 file

But, amanda doesn't use the "-b 1" option when writing backups.

Besides the SONY DDS4 tape drive should be DDS3 compatible.

Any suggestions?

Amanda