Patent ID: 8254224

Claim:
A method of reading signals from a master disk in a holographic replication system, the method comprising: providing one or more replica disks to replicate data from the master disk emitting a plurality of source beams toward a plurality of target data tracks in a master disk in the holographic replication system to form a plurality of illumination spots on the master disk; receiving a plurality of signal beams directed toward the one or more replica disks from the master disk, wherein the plurality of signal beams comprises reflections of the plurality of source beams and data to be replicated to the one or more replica disks from the master disk; determining whether the plurality of illumination spots is focused and aligned in the plurality of target data tracks, based on the plurality of signal beams; and adjusting the optical system when the plurality of illumination spots is determined to not be focused or to not align in the plurality of target data tracks.