Resonance phenomenon and its effects of laser texture disk

To achieve lower flying height for high areal recording density, the laser zone texturing of the disk needs to be designed to reduce glide height. One problem of the laser bump design is that the regular laser bump pattern of ten produces glide resonance phenomenon, which leads to failure of the glid e height test. However, it was found in this study that glide resonance is an intrinsic problem of the glide head used and resonance phenomenon depend s on the type of the head slider, that is, the natural frequency of the sli der body. Therefore, higher glide height or glide failure caused by glide r esonance does not lead to head/media interface problem in the real drive op erating conditions in which the data head is used. Pseudo-random bump patte rn greatly reduces the glide resonance. Smaller bump pitch will also help t o reduce the glide resonance. However, as bump spacing becomes smaller, gli de height will be increased due to increased air pressure developed around the bumps. Lowering bump height is the most effect way to reduce glide aval anche.