When a super resolution technology for optical disks is used in a situation where optical disk management information is formed with a signal that cannot be reproduced by a reproduction method based on a conventional optical disk technology, optical disk drives 302 cannot make recording adjustments and/or reproduction adjustments.
An optical disk drive 302 uses an optical disk 301 that forms a management information signal with pits not smaller in size than optical resolution and can be read by a reproduction method based on a conventional optical disk technology, and makes recording adjustments and/or reproduction adjustments in accordance with management information in a control data area (CDA), and especially, optimum recording power adjustments and/or optimum reproduction power adjustments for a super resolution region, which is a user data area (UDA). When the optical disk drive 302 records information onto or reproduces information from the optical disk 301 having the super resolution region, which is the user data area (UDA), it is possible to make proper recording adjustments or reproduction adjustments and perform a proper recording operation or reproducing operation in an optical disk's information region for user information recording or reproduction.