When all backups expire from a tape or a tape is manually marked for reuse, jobs can reuse the tape. In NetVault Backup 11.4.5 it fails to reuse the tape.
The logs will show an a new header being written on the tape. Then the tape will become FOREIGN and there will be an error "Header is not the one we expected".
If there are blank tapes available the job may continue with one of the blank tapes.
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