Patent ID: 8125880

Claim:
An information recording apparatus, comprising: a recording device for recording data, by a unit of physical sector, onto an information recording medium comprising a first recording layer and a second recording layer while giving an attribute, which corresponds to the recorded data, to each physical sector, wherein each physical sector includes data ID information, the data ID information includes area type information which indicates that the given attribute is a lead-in area attribute, a lead-out area attribute, a data area attribute which indicates a status in which user data of the data is recorded, or a middle area attribute; a first controlling device for controlling said recording device to record the data into each of the first recording layer and the second recording layer; a forming device for forming a shifted middle area, following the data recorded in each of the first recording layer and the second recording layer, by recording the data into the shifted middle area while giving the middle area attribute to each physical sector, wherein the middle area is an area for realizing reproduction compatibility of the information recording medium on an information reproducing apparatus and the middle area attribute indicates that the data for realizing the reproduction compatibility is recorded; and a second controlling device for controlling said recording device to record the data into the formed shifted middle area while changing an attribute of the shifted middle area to the data area attribute if the data is recorded after the shifted middle area is formed.