Patent ID: 7433288

Claim:
A recording device for recording first encoded data at a high bit rate and second encoded data at a lower bit rate than that of said first encoded data, both encoded data corresponding to the same material data, on an information recording medium, comprising: first generation means for encoding said material data input thereto so as to generate said first encoded data; second generation means for encoding said material data input thereto so as to generate said second encoded data; recording means for recording said first encoded data generated by said first generation means and said second encoded data generated by said second generation means on said information recording medium in an alternate manner in terms of time; and readout means for reading out said second encoded data recorded on said information recording medium while said recording means is recording any one of said first and second encoded data; storage means for storing said second encoded data recorded on said information recording medium by said recording means; and comparison means for comparing said second encoded means read out by said readout means with said stored second encoded data.