A method, system and apparatus for media storage is described. In one embodiment, an apparatus for storing media units has a housing having a lid and a base. The base has a plurality of receptacles. Each of the plurality of receptacles has a plurality of walls. A first writing surface is coupled to the housing.

A tray unit includes: a plurality of trays each of which has a protrusion at a side end portion thereof; and a pair of frames vertically provided with a plurality tiers of rail portions, the plurality of tiers of rail portions accommodating the plurality of trays in a slidable manner in a horizontal direction. And the rail portion at each tier include a clamp on a surface facing the side end portion of the tray, the clamps in the plurality of tiers are aligned in a vertical direction, the clamp has an opening to which the protrusion is fittable, and when the side end portion of the tray move to a predetermined position with respect to the rail portion, the clamp is elastically deformed in the vertical direction of the rail portion, and the protrusion is fitted into the opening.

A storage cabinet includes a cabinet body and is characterized in that at least one layer of storage unit is disposed in the cabinet body and is provided with sliding mechanisms capable of being pushed or pulled to move the storage unit forwards or backwards with respect to the cabinet body, and the storage units are installed layer by layer. The storage units and storage cabinet facilitate storage, taking and classification of a large batch of articles, reduce management cost and have a high degree of intelligence, thus, improving work efficiency.

A tray unit includes: a plurality of trays each of which has a protrusion at a side end portion thereof; and a pair of frames vertically provided with a plurality tiers of rail portions, the plurality of tiers of rail portions accommodating the plurality of trays in a slidable manner in a horizontal direction. And the rail portion at each tier include a clamp on a surface facing the side end portion of the tray, the clamps in the plurality of tiers are aligned in a vertical direction, the clamp has an opening to which the protrusion is fittable, and when the side end portion of the tray move to a predetermined position with respect to the rail portion, the clamp is elastically deformed in the vertical direction of the rail portion, and the protrusion is fitted into the opening.