Patent ID: 6883368

Claim:
A method for manufacturing a disk for a rotating disk drive data storage device, comprising the steps of: forming a disk for use in a disk drive data storage device, said disk having at least one data recording surface; characterizing microwaviness of said data recording surface of said disk by mounting said disk in a test fixture for characterizing microwaviness; characterizing warp of said disk with a sensor that is mounted to a carriage, the carriage being positionable along both an r-axis and a z-axis, the r-axis extending radially from a rotational axis of the disk, and the z-axis being perpendicular to said data recording surface; simultaneously rotating said disk and moving the carriage and the sensor relative to the z-axis to maintain a substantially constant distance between said sensor and said data recording surface, and relative to the r-axis; and characterizing microwaviness of said data recording surface using said sensor, while performing said step of simultaneously rotating said disk and moving the carriage and the sensor; and rejecting said disk for use in a disk drive data storage device if said microwaviness exceeds a pre-determined limit.