A media drive is loaded with a ROM medium on which a plurality of files constituting an application are recorded. A readout block reads out data from the media drive. A memory temporarily stores the read-out data. A providing block provides the data stored in the memory to game software. A recording processing block records the data stored in the memory in an auxiliary storage device.

An optical disk drive (ODD) including a shell and a locking module is provided. The shell includes a main body portion and a side portion, and the side portion is connected to the main body portion. A concave space is formed between a side surface of the main body portion and a top surface of the side portion. The locking module is disposed inside the concave space. The ODD is detachably held in a support frame of an electronic device through the locking module. In addition, a locking module is also provided.

An optical disk drive (ODD) including a shell and a locking module is provided. The shell includes a main body portion and a side portion, and the side portion is connected to the main body portion. A concave space is formed between a side surface of the main body portion and a top surface of the side portion. The locking module is disposed inside the concave space. The ODD is detachably held in a support frame of an electronic device through the locking module. In addition, a locking module is also provided.

Generating approximate usage measurements for shared cache memory systems is disclosed. In one aspect, a cache memory system is provided. The cache memory system comprises a shared cache memory system. A subset of the shared cache memory system comprises a Quality of Service identifier (QoSID) tracking tag configured to store a QoSID tracking indicator for a QoS class. The shared cache memory system further comprises a cache controller configured to receive a memory access request comprising a QoSID, and is configured to access a cache line corresponding to the memory access request. The cache controller is also configured to determine whether the QoSID of the memory access request corresponds to a cache line assigned to the QoSID. If so, the cache controller is additionally configured to update the QoSID tracking tag.