Patent ID: 8446808

Claim:
A method comprising the following steps: (a) in a holographic data storage system or device, providing a sequence of recorded holograms including a next hologram in the sequence to be recovered; and (b) adjusting at least one alignment control axis of the holographic data storage system or device to or towards a sufficiently optimal recovery position for recovery of the next hologram by the holographic data storage system or device based on a derived feedback error signal; wherein the feedback error signal is for adjusting at least one alignment control axis and is derived by the following steps: (i) imparting a wobble offset to one or more control axis alignments while sampling one or more holograms; (ii) using alignment-indicating data from sampling the one or more holograms to determine any misalignment in at least one control axis; and wherein the derived feedback error signal estimates a direction and magnitude of misalignment of the at least one alignment control axis for the next hologram based on alignment-indicating data for the one or more previously recovered holograms.