Oracle StorageTek T10000 Operator's Manual page 85

2 - Leader
If the leader was jarred out of the home position, it is loose and floppy, or
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might be fully retracted into the cartridge case.
If a load attempt was made with the leader out of the home position, the tape
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drive fully retracts the leader; it is pulled back into the cartridge and is no
longer visible.
Dropped Cartridges
Cartridge Care A-5