In this paper we discuss the technical issues of hydrodynamic bearings (HDB) for hard disk drives (HDD). We also report results of numerical analysis and of experiments aimed at solving the characteristic problems of high-speed HDDs. IntroductionTo meet the demand for higher-capacity and faster HDD, HDBs show promise. We report the design for HDB in the application of high-speed HDD, and others [1,2]. Design problems with HDB for HDDWe have developed and mass-produced HDBs for six different types of automated office and audio-visual equipment. HDBs for a high-speed HDD application, however, are more exacting and technically more difficult in terms of rotation speed, reliability and rotational precision, than for the formerly cited products. Figure 1 shows the existing HDB applications.There are two important design issues for high-speed HDD bearings:(1) Optimization of groove angles to prevent bubble ingestion.(2) Structural design considerations with respect to highspeed rotation.

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