Design and dynamic analysis of suspension for dual actuator type HDD

The track density of HDD is increasing rapidly as the recording density dra stically increases, which leads to the need for a higher servo bandwidth. T o this end, a dual actuator system for HDD has been suggested as a possible solution. Furthermore, the suspension resonance frequency in the radial ac cess direction is becoming a more important factor for the servo bandwidth increase. However, the improvement of these frequencies may affect the shoc k resistance performance and spring constant. In this work, we have investi gated a suspension design scheme possessing a microactuator as a dual actua tor and also achieving high-mechanical resonance frequencies, shock resista nce characteristics, and a low-spring constant. Using finite element analys is, the design parameters, which play key roles for dynamic characteristics of a suspension, are investigated. Design parameters are deduced based on physical insight and observations. It is confirmed that the proposed suspen sion has the capability of fine tracking motion as a microactuator, due to its hinge structure on the spring region, and achieves higher mechanical re sonance frequencies in the 2nd torsion mode and sway mode with a high-shock resistance and a low-spring constant.