Disk apparatus, and recording/reproduction method therefor

A disk apparatus for accessing a disk medium having a data plane on which head positioning information and record information are stored, the disk apparatus comprising:

• a disk drive for driving the disk medium and recording the information on or reproducing the information from the disk medium, said disk drive having a head via which the information is to be recorded on or reproduced from the disk medium;
• and
• a disk control section for controlling said disk drive in accordance with instructions received from a higher-level device, said disk control section including:
• an identification section for identifying information regarding a position on the disk medium at which said head positioning information is stored,
• a medium deficiency position identification section for identifying information regarding the position of a deficiency of said disk medium on the basis of the information recorded on said disk medium,
• a position calculation section for calculating the position on the disk medium where recording/reproducing of said record information is to be performed,
• a comparison and decision section for comparing the information regarding the position, which is identified by said identification section or said medium deficiency position identification section, with the position information, which is calculated by said position calculation section, upon each reception of a predetermined command is received from said higher-level device and for deciding whether or not the position identified by said identification section or said medium deficiency position identification section is the position at which said record information is to be recorded or reproduced, and
• a skip control section for carrying out a control such that when it is judged, on the basis of the result of the comparison made by said comparison and decision section, that the position identified by said identification section or said medium deficiency position identification section is the position at which recording/reproduction of said record information is to be performed, the position identified by said identification section or said medium deficiency position identification section is skipped.