Laser texturing recording medium with a random signal driven modulator

摘要

PCT No. PCT/US98/16655 Sec. 371 Date Aug. 10, 1998 Sec. 102(e) Date Aug. 10, 1998 PCT Filed Aug. 10, 1998 PCT Pub. No. WO99/11418 PCT Pub. Date Mar. 11, 1999A 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.