> After of Backup OK attempt mount the same tape but return message:
> "If this is not a blank tape, try unmounting and remounting the
> Volume.". what cause this performance?. Is possible that one Job (with
> very big data) exceeds of max capacity storage of tape and rewind tape
> and next rewrite the start of tape erased Bacula-label?. Thanks.
>

With compressed tapes (DLT, LTO ...) there is no fixed max capacity.
The drive writes until the entire tape is used with varying
compression rates depending on your data.

However if you use /dev/st0 instead of /dev/nst0 yes with that it is
possible the drive was rewound and then overwritten.

John

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