Abstract: A carrier tray having a plurality of compartments separated by a plurality of dividers. Each carrier tray has a plurality of stacking pins on a top portion and a plurality of pin holes on a bottom portion. Each stacking pin is located in an area approximately adjacent to each pin hole such that, for a given set of a stacking pin and a pin hole, the stacking pin is slightly offset relative to the pin hole. When stacking the carrier trays to form a stacked configuration of carrier trays, each carrier tray is rotated 180° relative to a carrier tray immediately below and a carrier tray immediately above the carrier tray.

Abstract: A tape drive (20) detects engagement of scanner cleaning assembly (200) with a scanner (90). A cleaning engagement detector (111) uses rotational velocity of the scanner (90) in order to detect engagement of a cleaning wheel (204) with the scanner (90). In particular, cleaning engagement detector (111) detects engagement when a rotational period of the scanner (90) increases by a predetermined amount. When the cleaning engagement detector (111) detects engagement of the cleaning wheel (204) with the scanner (90), a microprocessor (100) controls a duration of the engagement, thereby avoiding wear both of the cleaning wheel (204) and of the heads on the scanner (90).