Abstract: An optical disc device includes: an optical disc drive that reads data from a plurality of optical discs in which user data is recorded while distributed in the plurality of optical discs; a memory unit in which data read from an optical disc of a first group that is a part of the plurality of optical discs is recorded through the optical disc drive; and a controller that reproduces the user data from data of a remaining optical disc except for the first group, the data of the remaining optical disc being read through the optical disc drive, and the data recorded in the memory unit.

Abstract: An optical disc device includes: an optical disc drive that reads data from a plurality of optical discs in which user data is recorded while distributed in the plurality of optical discs; a memory unit in which data read from an optical disc of a first group that is a part of the plurality of optical discs is recorded through the optical disc drive; and a controller that reproduces the user data from data of a remaining optical disc except for the first group, the data of the remaining optical disc being read through the optical disc drive, and the data recorded in the memory unit.

Abstract: Recording failure area information includes information indicating an optical disk having a recording failure area in which data is missing, and indicating a position of the recording failure area in the optical disk, out of the optical disks constituting a disk array. A controller (110) includes a recording controller (121) which records data in data blocks of the optical disks by striping the data, and records, in at least one parity block, at least one parity data for use in recovering data in a data block in which the data is missing, out of the data blocks; and a management information updater (125) which records recording failure area information in a management information area of at least one of the optical disks, in the case where data is missing in at least one of optical disk drives at the time of data recording.

Abstract: Recording failure area information includes information indicating an optical disk having a recording failure area in which data is missing, and indicating a position of the recording failure area in the optical disk, out of the optical disks constituting a disk array. A controller (110) includes a recording controller (121) which records data in data blocks of the optical disks by striping the data, and records, in at least one parity block, at least one parity data for use in recovering data in a data block in which the data is missing, out of the data blocks; and a management information updater (125) which records recording failure area information in a management information area of at least one of the optical disks, in the case where data is missing in at least one of optical disk drives at the time of data recording.