Patent ID: 7065671

Claim:
An information processing apparatus for converting a parameter of an access command into a physical address of an information recording surface of a recording medium, and accessing said recording medium in accordance with the physical address, said information processing apparatus comprising: an exchange allocating processing means for detecting a region in relation to a secondary defect from said information recording surface, and setting one exchange region to be used for a recording and reproducing process so as to replace said region in relation to said secondary defect; wherein a secondary defect list is detected by a read-write data channel and a servo circuit in accordance with an access command for carrying out said recording and reproducing process; a defect judgment means for judging said physical address based on said access command by using said physical address of the region in relation to said secondary defect as a reference; and an exchanging processing means for carrying out the process according to said access command by using a predetermined recording means different from said recording medium, for the region in relation to said secondary defect among said physical address based on said access command, in accordance with a judged result by said defect judgment means, wherein a primary defect is detected at a sector unit of the recording medium and registered in a primary defect list by said primary defect physical address.