Patent ID: 8355304

Claim:
A method for reproducing an optical information recording medium, the optical information recording medium comprising: a first area in which a content is recorded by forming recording marks, one or more of the recording marks being shorter than a length of a resolution limit of an optical system in a reproducing device; and a second area in which medium identification information for specifying a type of the medium is recorded as a form of concavities and/or convexities formed during production of the optical information recording medium, the concavities and/or convexities as a form of which the medium identification information is recorded, being not shorter than the resolution limit of the optical system, in the second area, (i) information for determining reproduction laser power and (ii) information each being further recorded, as a form of concavities and/or convexities that are not shorter than the resolution limit of the optical system in the reproducing device, the information (ii) being information for determining a linear velocity in reproduction of the content recorded in the first area so that digital processing is carried out with respect to the content by use of a reproduction clock which is identical to a reproduction clock that is used to carry out digital processing with respect to the second area, the first area having a track pitch which is narrower than a track pitch of the second area, the method comprising the steps of: in reproducing information recorded in the first area in the optical information recording medium, (a) after having read out, from the second area, the information for determining a linear velocity, in order to allow digitalization of the analogue waveform obtained during reproduction of the information recorded in the first area, based on the information for determining a linear velocity, determining a linear velocity so that digital processing is carried out with respect to the first area by retaining the reproduction clock that is used to carry out digital processing with respect to the second area and using the reproduction clock thus retained; and (b) after having read out, from the second area, the information for determining reproduction laser power, determining reproduction laser power based on the information for determining reproduction laser power.