Media Set Not Appendable : Slots Fail to Mount (HP StorageWorks 1/8 and Backup Exec 2010)

Hi Fellow Members

I configured a Backup Job to run during the weekend. The Job is configured to backup a small NAS Server.

1. The backup was targeted to a Media Set containing 3 Tapes of 400 GB each.
2. The 3 tapes are in Slots 6, 7 and 8 respectively.
3. The Media Set has an Overwrite Protection of 27 Days.
4. The Media Set has an Append Period of 2 Days
5. The Job started on 25th July at 21:00 hours and the Tape from Slot 6 was mounted.
6. On 26th July at 09:09:00 hours the log file states a "Drive and Media Mount Requested". What I understand according to this log entry is that Slot 7 was never mounted after Slot 6 was full.
7. Under Devices Slots 7 and 8 show up as "Not Appendable" while slot 6 shows up as "Not Appendable (Media Full)".
8. I am struggling to understand that if the Append Period is 2 Days and the Job started on 25th July at 21:00:00 hours , why was the Tape from Slot 7 not mounted on 26th July at 09:09:00 (as per the log).

If i have made a configuration error - can someone please point it out to me ?

Thanks a Lot !