Abstract

The demand for high performance, low cost, and nonvolatile information storage systems is ever-increasing. There is a variety of information storage systems with varying degrees of development and commercialization, including magnetic tape drives, magnetic hard disk drives, magnetic floppy disk drives, magneto-optic disk drives, phase-change optic disk drives, semiconductor flash memory, magnetic random access memory, and holographic optical storage. This chapter provides an overview of magnetic information storage systems, particularly magnetic hard disk drives and reviews basic magnetics. Among the magnetic storage systems, the magnetic hard disk drive is the dominant secondary mass storage device for computers ranging from notebooks to mainframes because of its large storage capacity, low cost per megabyte, reasonably fast access time and a relatively mature manufacturing infrastructure.

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