Information recording apparatus, information recording method

An information recording apparatus for performing data recording processing includes: a data storage portion holding write data on a disk; an apparatus control portion for managing the data storage portion and controlling data recording processing; and a disk recording control portion obtaining data held in the data storage portion and performing processing of recording on the disk through data holding means, wherein the apparatus control portion is configured to perform, in the data recording processing on the disk, processing of: defining boundary information indicating the boundary position between disk-recorded-guaranteed data, which is guaranteed as data having been recorded on the disk completely, and unguaranteed data in data held in the data storage portion; and deleting the disk-recorded data identified by the boundary information selectively from the data storage portion.