Hi Kelly ,

from LTO documentation :

The bar code format is:
. Quiet zones (at each end of the bar code)
. A start character (indicating the beginning of the label)
. A six-character volume label
. A two-character cartridge media-type identifier (L1), which identifies the
cartridge as an LTO cartridge ('L') and indicates that the cartridge is the
first generation of its type ('1')
. A stop character (indicating the end of the label)
When read by the library's bar code reader, the bar code identifies the
cartridge's volume label to the tape library. The bar code volume label also
indicates to the library whether the cartridge is a data, cleaning, or
diagnostic
cartridge.

Regards
       Petr