Patent ID: 8065495

Claim:
An information processing apparatus for recording data onto a recording medium, comprising: an access controller configured to output, to a medium-specific controller, record data input from an application and directed to the recording medium, each physical sector corresponding to an integer number of logical sector units, a logical sector unit at a phase change point not being used to store any data, the access controller performing a first read-modify-write (RMW) operation only for read and write operations before the phase change point and a second RMW operation only for read and write operations including or after the phase change point, the access controller configured to perform the second RMW operation by verifying whether one of a record start position and a record end position of the record data input by a logical sector unit from the application is different from a delimitation position of a physical sector as an access unit of the recording medium managed by the medium-specific controller, acquiring the record data by the physical sector unit via the medium-specific controller and storing the record data onto a memory if one of the record start position and the record end position is different from the delimitation position, the storing the record data including changing a memory location of the data in the memory based on the phase change point, updating logical sector data as part of stored physical sector data with the record data input by the sector unit from the application, and outputting the updated physical sector data to the medium-specific controller.