HP 20/700 - Manual (Page 170)

Appendix A DLT Drives and Tape Cartridges 169
Appendix A
Caution 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.
Figure 48 Proper DLT Label Position
Note You can order additional bar code labels if needed. For bar
code ordering information, see Ordering Tape Cartridges
on page 193 as well as the information that came with your
tape library.