Patent ID: 8032721

Claim:
An access control apparatus controlling an access to a recording area of a recording medium on a command with a command completion time limit requiring completing the command in a predefined period of time, the access control apparatus comprising: a writable and readable memory; a command executor executing an access process on the command with the command completion time limit, storing an address of an inaccessible recording area in the memory when an access error is caused, obtaining data attempted to be written on the inaccessible recording area, storing the data associating to the address of the inaccessible recording area in the memory; an automated alternate processor executing an automated alternate process of the inaccessible recording area in a predefined period of time after the process executed by the command executor is completed; and a memory updater deleting the address of the inaccessible recording area whose automated alternate process has succeeded and the data attempted to be written in the recording area at the address from the memory.