Patent ID: 7333281

Claim:
A method to write servo information on a disc in a disc drive, the method comprising: centering on a cylinder of the disc having skew ‘0’, sequentially writing servo information toward the cylinder having skew ‘0’ from an outer surface in an outer region, and sequentially writing the servo information toward the cylinder having skew ‘0’ from an inner surface in an inner region; after the writing the servo information is completed, inspecting the servo information written in a cylinder at a predetermined distance from the cylinder having skew ‘0’, and determining whether the servo information is correctly written; if errors do not occur in the cylinder at the predetermined distance from the cylinder having skew ‘0’, track-defect-processing all tracks within the predetermined distance from the cylinder having skew ‘0’, such that a normal search operation cannot be performed; and if errors occur in the cylinder at the predetermined distance from the cylinder having skew ‘0’, determining that all of the servo information is not correctly written, and writing the servo information for the entire disc again.