A hard disk has, in recent years, become an essential component for a personal computer as well as a work station. A hard disk stores a variety of files, which are daily updated. The files in a hard disk are, however, lost because ofhuman errors and afailure of the hard disk. This is called a hard disk failure. In order to protect usfrom such a serions loss, it is important to make a backup cop...

This paper extends the standard root locus technique to systems with saturating actuators. This is accomplished by introducing the notion of S-poles, which are the poles of the quasilinear system obtained by applying the method of stochastic linearization to the system with saturation. The path traced by the S-poles on the complex plane when the gain of the controller changes from 0 to ∞ is the...

Integration of the Hard Disk Controller (HOC) today has taken on an extensive amount of functionality. From the host interface, error correction code, disk sequencer, microprocessor(s), servo control logic, buffer controller, to the embedded memory, the HDC has become a true system on a chip. Depending on the product, embedded DRAM is used as buffering for data between the host and media and po...