Patent ID: 7564768

Claim:
A recording and reproducing apparatus for recording data on a recording medium having a holographic recording area and a buffer recording area, comprising: a holographic recording controller which multiplexedly records user data as page data in a holographic form on the holographic recording area; a buffer recording controller which records user data on the buffer recording area; and a recording controller, upon receiving a request writing a user data, which controls recording of user data in the write request on one of the holographic recording area and the buffer recording area, wherein the recording controller includes: a capacity determination unit, upon receiving a request writing a user data, which determines whether total data amount of at least an amount of data recorded on the buffer recording area and an amount of the user data in the write request is equal to a predetermined capacity value or not; and a recording region selection controller which records the user data on the buffer recording area by the buffer recording controller when the capacity determination unit determines that the total data amount is less than the predetermined capacity value, and records total data including at least data recorded on the buffer recording area and the user data in the write request in a lump onto the holographic recording area by the holographic recording controller when the capacity determination unit determines that the total data amount is equal to or larger than the predetermined capacity value.