Method of storing rll encoded information to an optical disc with control of the frequency of the information with respect to the cut-off frequency of the optical system

摘要

A method of storing/retrieving information to/from an optical disc by means of an optical system with a cut-off frequency ν_cut-off, above which frequencies cannot be detected, is disclosed. The invention relates to Run Length Limited encoded information. According to the invention, some frequencies of the encoded information can be higher than cut-off frequency of the optical system, such that the equation 4*(d+1)*L_cd*NA/λ_laser1 is satisfied, where d+1 is the minimum run length of the coding, L_cd is the length of a channel bit, NA is the numerical aperture and λ_laser is the wavelength of the optical system. Hereby, the capacity of the optical disc is increased, while the prevailing coding technique is used. Moreover, the invention relates to a disc for storing of data, a drive capable of storing data and an apparatus for manufacturing optical discs.