HP STORAGEWORKS SSL1016 - Manual (Page 65)

Tape Cartridge Usage
65 SSL1016 Tape Autoloader Reference Guide
b. For SDLT cartridges: The loop should stick up about an eighth of an inch
when viewed from the edge; the loop must be a closed loop. If the loop is
torn, bent, pulled in, or not sticking up about an eighth of an inch, do not
use the tape cartridge.
Figure 47: Checking the SDLT tape leader
1
Good
2
Worn (do not use)