If the tape has been ejected from the library and reinserted this will
happen.  I also seem to remember this happening when a tape is empty and has
a reuse period in the stg pool causing this.  The tape is private because it
is still in the pool and can be reused but the last use is cleared to
reflect nothing on the tape.

Paul D. Seay, Jr.
Technical Specialist
Naptheon, INC
757-688-8180