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1 前言磁记录硬盘 ( HDD)随着计算机需求的扩大取得发展。记录密度以 6 0 %的速率逐年递增 ,近十年持续增长约 1 0 0倍。另一记录媒体光盘 ,除了用于 PC机以外 ,还作为声盘、视盘用。 1 982年上市了 CD盘 ,作为计算机用 CD- ROM占领了急剧变化的市场。可重写型光盘在磁光盘和
1 Introduction Magnetic recording hard disks (HDDs) have evolved as the demand for computers has grown. The recording density has been increasing year by year at a rate of 60% and has been increasing by about 100 times in the past ten years. Another recording media CD, in addition to PC, but also as a sound disc, video disc use. CD-ROM was released in 1982, occupying a rapidly changing market as a CD-ROM for computers. Rewritable discs on magneto-optical discs and