HP 20/700 - Manual (Page 152)

Appendix A HP Ultrium Drives and Tape Cartridges 151
Appendix A
Note Only use approved Ultrium cleaning cartridges with HP Ultrium
tape drives. For data cartridges, only use those specified as
having met Ultrium standards. Approved media will have the
Ultrium format trademark (see Figure 42 on page 151), which
indicates that the media has passed Ultrium format compliance
testing. For best results, always use HP branded media.
Figure 42 Ultrium Format Trademark