HP 20/700 - Manual (Page 156)

Appendix A HP Ultrium Drives and Tape Cartridges 155
Appendix A
Figure 44 Ultrium Cartridge Recessed Area
Caution The bar code label should be applied with the alphanumeric
portion facing the hub side of the tape cartridge ( Figure 44 on
page 155).
Never apply multiple labels onto a cartridge, as extra labels can
cause the cartridge to jam in a tape drive.
Do not apply labels onto the top, bottom, sides, or back of the
cartridge as this may cause damage to the tape drive or interfere
with reliable operation.