Hello,
The incorrect media capacity problem is usually observed on tape devices
which do not have Media Capacity Checker functionality. Generally, for most
of the tape devices, this functionality is initiated from the firmware of
the tape device. Even though the tape capacity is reported incorrectly,
during the backup operation, the entire media capacity should be consumed.
Also perform a full backup until the tape is filled for example if the tape
capacity is 40 GB then perform a backup of 40GB with overwrite option. Once
the backup is completed and next time when the tape is inserted for backup,
check the media capacity displayed.
NOTE : If we do not receive your reply within two business days, this post would be marked assumed answered and would be moved to answered questions pool.