HP 20/700 - Manual (Page 25)

24 Tape Library Components Chapter 1
Reserved Cells
Figure 5 on page 25 shows the cells reserved for swapping cartridges and for
diagnostic and cleaning cartridges. The top cell is the swap cell, which is
reserved for in-transit cartridges. Do not place any cartridges into this cell. You
may place any type of cleaning or diagnostic cartridges into the other 11 cells.
Note Loading cleaning cartridges into any of these 11 cells enables
Auto Clean upon the next IPL.
Caution System degradation: Do not insert data cartridges into these
reserved cells. The host software will not find these cartridges.