Abstract: A system for optical disc storage, writing and reading including a housing holding at least two optical disc racks and a plurality of read/write drives that may be positioned in line with the storage rack. A track spans the racks, (e.g., a parallel track is positioned between two racks). A shuttle mounted on the track allows transfer of discs from the racks to drives. The shuttle may allow for disc pass through, disc rotation, or have other structures for disc transport.

Abstract: An optical disk cassette has a cassette case with a disk retention device. A free end of the disk retention device acts upon an edge of the optical disk, opposably displacing during insertion and ejection of the optical disk. The device and disk are at equilibrium when the free end is displaced by the full diameter of the disk. When the disk is displaced in the insertion or ejection direction, the free end urges the disk in the insertion or ejection direction, assisting with the optical disk insertion or ejection respectively. Embodiments may have the disk retention device including one or more retainers. Each retainer may have a free end and opposing fixed end, and be flexible or have a flexible region. The free end slides along or otherwise contacts the circumferential edge of the optical disk, exerting a force upon it during optical disk insertion, retention and ejection.