Method of controlling data writing velocity and optical disk player

An optical disk player,

• comprising:
• an optical pick-up irradiating a laser beam for writing data on an optical disk and receiving a reflected beam reflected from the optical disk;
• means for analyzing an address of the optical disk to which said optical pick-up irradiates the laser beam on the basis of wobble signals included in the reflected beam received by said optical pick-up;
• and
• velocity control means for changing data writing velocity when the address to which said optical pick-up irradiates the laser beam reaches a prescribed address,
• wherein said velocity control means analyzes a track pitch of the optical disk on the basis of a moving distance of said optical pick-up in a prescribed time and the address thereof when a data writing test is executed in an innermost area of the optical disk, judges if the optical disk is a standard optical disk having a standard track pitch or not, calculates an address of changing the data writing velocity on the basis of the analyzed track pitch if the optical disk is a nonstandard optical disk, and changes the data writing velocity when the address to which said optical pick-up irradiates the laser beam reaches the calculated address.