Information recording medium, recording/reproducing apparatus, and recording/reproducing method to distinguish between an original recording block and a replacement recording block

A recording/reproducing apparatus, wherein the second recording unit block is selected in a user data area of the information recording medium in response to a command to record second data in the first recording unit block in which first data already has been recorded;

• the second recording unit block has a logical address identical to a logical address of the first recording unit block;
• and
• the defect list entry comprises:
• physical address information of the first recording unit block;
• and
• physical address information of the second recording unit block.

A reproducing apparatus, wherein the second recording unit block is selected in a user data area of the information recording medium in response to a command to record second data in the first recording unit block in which first data already has been recorded;

• the second recording unit block has a logical address identical to a logical address of the first recording unit block;
• and
• the defect list entry comprises:
• physical address information of the first recording unit block;
• and
• physical address information of the second recording unit block.

A recording method, wherein the second recording unit block is selected in a user data area of the information recording medium in response to a command to record second data in the first recording unit block in which first data already has been recorded;

• the second recording unit block has a logical address identical to a logical address of the first recording unit block;
• and
• the defect list entry comprises:
• physical address information of the first recording unit block;
• and
• physical address information of the second recording unit block.

A reproducing method, wherein the second recording unit block is selected in a user data area of the information recording medium in response to a command to record second data in the first recording unit block in which first data already has been recorded;

• the second recording unit block has a logical address identical to a logical address of the first recording unit block;
• and
• the defect list entry comprises:
• physical address information of the first recording unit block;
• and
• physical address information of the second recording unit block.