Patent ID: 7522502

Claim:
A device for writing data to and reading data from an optical disc medium having thereon a plurality of areas in which management information about the optical disc medium is redundantly stored, the plurality of areas being concentrically formed, the management information being updated, the device comprising: a spindle motor for rotating the optical disc medium; a pickup for writing data to and reading data from the optical disc medium; a read/write circuit for processing read and write signals input to and output from the pickup; a servo circuit for controlling rotation of the spindle motor and movement of the pickup; a microprocessor for controlling a read operation of the pickup through the read/write circuit and the servo circuit and for setting read/write conditions for the device based on the management information read from the optical disc medium; and control memory for storing control conditions and the read/write conditions set by the microprocessor; wherein the management information about the optical disc medium includes a first management information group, a second management information group, and third management information, the third management information including conditions for setting a read/write operation and stored in the inner circumferential area of the optical disc medium, the first and second management information groups each including a valid address of the third management information and stored in the inner circumferential area and the outer circumferential area of the optical disc medium, respectively; and wherein the pickup performs the steps of: reading the first management information group from the inner circumferential area; retrieving the third management information based on the valid address included in the first management information group; moving to the outer circumferential area and reading the second management information group; and if the update count of the second management information group is higher than that of the first management information group, moving to the inner circumferential area and retrieving the third management information based on the valid address included in the second management information group.