Laser texturing magnetic recording medium with ultra-fine texture pattern

摘要

A method and apparatus for laser texturing data storage media surfaces to provide ultra-low glide avalanche in disk drives employs a continuous wave laser that is randomly modulated. A random signal generator produces a random signal that controls an acousto-optical modulator. The acousto- optical modulator, in accordance with the random signal, modulates the laser beam output of a continuous wave laser. A controllable, repeatable pattern is provided on the data storage media surface by the laser texturing with limited randomness in the circumferential direction to avoid resonance effects on a slider.