The precise knowledge of the force and moment generated by the air squeezed under the read-write slider by the rotating disc is an\r\nengineering necessity in designing the air bearing surface slider. This paper reviews methods addressing the thin gas film bearings\r\nproblem. It firstly reviews briefly the relatively well-known two methods of calculations of the microgas flows under flying head\r\nsliders, the generalized Reynolds equation, having given a number of useful results of slider design, and the DSMC method, which\r\nis precise and appropriate for the flow of complex configurations but is restricted to miniature (~micrometer) size sliders. The\r\nmain purpose of the paper is to introduce to the reader an alternative method, the information preservation (IP) method, for use\r\nin simulation of the flows under air bearing surfaces. Some recent results of IP simulation of slider flows published on conference\r\nproceedings are introduced here.
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