How do I empty a tape volume when:

 

            Q content volumeID

 

Shows no content

 

            Q vol volumeID

 

Shows 0.0 percent full

 

            MOVE DATA volumeID

 

Says volume contains no data

 

            Delete vol volumeID

 

Says volume still contains data

 

I am guessing that this is a volume where a large file was written to a
previous volume, and it 'overflowed' onto this one.

 

How do I find the predecessor volume?