Spectra Logic 2K - Manual (Page 53)

Chapter 6. Library Stacker Mode
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4. Shut the door, open it for less than two seconds, then close it. The library loads
the first cartridge into Drive 1.
5. Issue a command over the SCSI bus. The library stacker mode cycles through
cartridges as they are filled with data until the command completes or the
stacker runs out of unused data cartridges.
Note: To differentiate between tapes containing data and unused tapes,
always insert the DCM in the library with the top slot empty. This
way, once the store completes, an empty slot separates the tapes
with data from the tapes not used (see the diagrams on page 50).