This should be an easy one, and for me, am having a thick moment.....

I have backup exec 12.5 on a win2003 server, with an external Dell LTO2 drive...

I have 5 tapes, which i use to do daily backups (195gb per day).  I use the 'Daily Backup Set'.

I've just purchased 2 new LTO2 tapes, as wanting to store monthly backups...

However, i cant get BE to write to the tapes ?  eventual error is tape drive dirty, yet stick the original 5 in the drive, all works fine...
I try to run the 'Media Label' to call the tape a name, but still get same error ? :(

Do i need to do anything so BE can write to any tape i stick in the drive ?