Abstract
Operational shock is one of the key challenges for designing ultrathin mobile hard disk drives (HDDs) due to the reduced thickness and stiffness of their mechanical components. The conventional operational shock simulations use the simplified models and methods that decouple the structural and air bearing dynamic analyses. These simplifications are not accurate as the coupling effect of air bearing and structural dynamics are ignored, and are even not valid in predicting the slider-disk contacts. In this paper, a method for the system level modelling and simulation of operational shock response of HDDs is proposed by integrating the structural finite element model of the HDD and the air bearing model, and coupling the structural dynamics analysis with the dynamic air bearing simulations. The dynamic shock response of the head-disk system in a 5 mm ultrathin HDD design is investigated. The effects of the drive base deformation together with the disk-ramp contact have been studied. The results reveal that the drive base deformation and disk-ramp contact are critical for the operational shock resistance performance of ultrathin drives.
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