Abstract: A mount assembly configured to be cooperative with expansion card and socket of circuit board. Mount assembly includes first slide rail, second slide rail, first latch and first slidable stopper. First latch includes first cantilever and first protrusion. First cantilever includes first fixed end part and first free end part that are located opposite to each other. First fixed end part is fixed to sidewall part of first slide rail. First protrusion protrudes from first free end part and is located in groove of first slide rail. First protrusion is configured to be engaged with engagement hole of expansion card. First slidable stopper includes stopper body and handle portion. Stopper body is slidably disposed on sidewall part of first slide rail and movable between blocking position and releasing position. Handle portion protrudes from side of stopper body.

Abstract: A library apparatus includes cartridges each including a first fitting portion formed on a first surface and a second fitting portion formed on a second surface, a storage unit, and a transporting unit including a pulling unit to pull out a first cartridge from the storage unit, a first supporting unit provided under the pulling unit, having a tapered first distal end unit, and to insert the first distal end unit between the first cartridge and a second cartridge positioned under the first cartridge to release the fitting between the first cartridge and the second cartridge, and a second supporting unit provided above the pulling unit, having a tapered second distal end unit and to insert the second distal end unit between the first cartridge and a third cartridge stacked on the first cartridge to release the fitting between the first cartridge and the third cartridge.

Abstract: A disc storage unit includes a case, a tray supported by the case and configured to support an array of discs in respective parallel vertical planes across which respective coaxial axes of the discs pass horizontally. There is a disc-raising mechanism having a finger activatable to lift one of the discs from the tray within its respective plane to thereby render that disc non-coaxial with other discs that might be supported by the tray. The storage unit also includes an indexing mechanism that is configured to cause the disc-raising mechanism to raise others of the discs in a like manner. This enables labels of the raised discs to be viewed for selection by a user.