Patent ID: 8185705

Claim:
An information recording medium for storing data managed by a file system, comprising: a first physical recording area in which file system management is managed; a second physical recording area in which file data is managed; a first receiver operable to receive a position setting command for setting a position and a size of the first recording area, the position setting command including an address which is a logical address and a size of the first recording area; a storage operable to store the address included in the position setting command received by the first receiver; a second receiver operable to receive a write command for writing data, the write command including an address which is a logical address, and write data; and a selector operable to select the first or second physical recording area as an access area according to the address stored in the storage and the address included in the write command received by the second receiver, wherein the selector selects the first physical recording area as an access area when the address stored in the storage matches the address included in the received write command, and selects the second physical recording area as an access area when the address stored in the storage does not match the address included in the received write command.