Abstract
Magnetic storage and retrieval devices include tape, flexible disk and rigid disk drives used for audio, video and data processing applications. The magnetic recording process involves relative motion between a magnetic medium (tape or disk) against a stationary or rotating read/write magnetic head. For construction and materials used in magnetic head and medium components, refer to [1] – [3]. The need for ever increasing high recording densities requires that surfaces should be as smooth as possible and flying height (physical separation or clearance between a head and a medium) be as low as possible. In modern tape and flexible and rigid disk drives, flying height ranges from about 25 nm to 50 run, and roughness of the head and medium surfaces ranges from about 1.5 to 5 nm rms. As an analogy, a magnetic head slider flying over a disk surface with a flying height of 25 nm with a relative speed of 20 m/s is equivalent to an aircraft flying at a physical spacing of 0.2 μm at 900 km/h, Fig. 1. This is what a disk drive experiences during its operation.
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Bhushan, B. (2001). Macro- and Microtribology of Magnetic Rigid Disk Drives. In: Hadjipanayis, G.C. (eds) Magnetic Storage Systems Beyond 2000. NATO Science Series, vol 41. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0624-8_44
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DOI: https://doi.org/10.1007/978-94-010-0624-8_44
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