Can't continue backup from full tape to another tape in one media set

Hi All,

I got some issues with the Backup exec 2014:

1. When the job backup to the tape and then the tape is fulled, but the job don't change to another tape in the same media set.

2. If I don't check "Eject the media after the job compleles", the job won't write to correct media set and will change to the "associate media" to the media set of the job.

3. What meaning of media overwrite options:

-  Overwrite scratch media before overwriting recylable media contained in the targeted media set.

-  Overwrite recyclable media contained in the targeted media set before overwriting scratch media.

anyone have solutions?

Thanks in adv!!!