Patent ID: 8169459

Claim:
A compensation method in a radial direction on a label side of an optical disc, comprising: (1) inserting an optical disc into an optical disk drive with a data side of the optical disc facing an optical pick-up head (OPU); (2) dividing the data side of the optical disc into at least one compensation area; (3) sequentially moving the OPU from inner rings to outer rings of the optical disc by simulating a writing process; (4) moving the OPU to some pre-determined points of the compensation area and performing radial-directional compensation to obtain radial-directional voltage gains at the pre-determined points; (5) recording the radial-directional voltage gain obtained at each pre-determined point; (6) inserting an optical disc to the optical disk drive with the label side of the optical disc facing the OPU; (7) calculating a simulated track number according to a required moving distance for the OPU to write pattern on the label side; (8) moving the OPU by a radial-directional lens driving voltage compensated with a voltage gain obtained from a voltage compensation formula; and (9) writing the label side of the optical disc.