Patent ID: 7564761

Claim:
A recording and reproducing device comprising: a reference light irradiating section for irradiating a holographic recording medium with reference light for reading page data recorded on the holographic recording medium; a spatial light modulating section for generating information light modulated using two-dimensional information corresponding to the page data to be written to the holographic recording medium; an information light irradiating section for irradiating the same region as a region irradiated with the reference light, with the information light; a light detecting section for receiving reproduction light generated by irradiating the holographic recording medium with the reference light; a known data storage section for storing first known page data in advance; a data recording control section for converting the first known page data stored in the known data storage section so that the converted page data can be supplied to the spatial light modulating section; a defect examining section for distinctly examining a defective position of the spatial light modulating section and a defective position of the light detecting section, by irradiating the holographic recording medium with the information light modulated using the two-dimensional information corresponding to the first known page data and the reference light using the information light irradiating section and the reference light irradiating section to write the known page data to the holographic recording medium, and then by using the first known page data read from the reproduction light received by the light detecting section by irradiating the medium with the reference light using the reference light irradiating section, and second known page data recorded in advance on the holographic recording medium; and a reproducing control section for restoring and reproducing the original data of the defective position contained in the reproduction light received by the light detecting section using information of the defective position detected by the defect examining section, wherein the defect examining section includes a determining section for determining whether the defect is in the spatial light modulating section or the light detecting section based on the information of the defective position detected by the defective position examination.