Design of a large capacity disk drive with two actuators

Multiobjective optimization of hard disk suspension assemblies: Part I—structure design and sensitivity analysis

“…Since the flying height is observed always to oscillate but at a very small amplitude [3], its excessive vibration induced by disturbances must cause catastrophic damage to the hard disk system. Major sources of disturbances include vibrations from actuator arm, surface roughness of the disk, spindle/ bearing inaccuracies [4], rotating flow around the suspension [5,6], and so on.…”