摘要: Magnetic recording media can take the form of tape, floppy disk, or hard (rigid) disk. The Signals recorded could be analog digital. In Computer data storage applications, all are stored in digital form. Tapes and disks used for permanent on-line storage. principles these methods well described magnetic handbook other reference books (Mee Daniel, 1996). This chapter will focus on disk drives, which have experienced most significant development recent years represent technical challenges.