Hard disk consists of a number of platters which are circular discs on which data are recorded. Data is recorded in circular tracts on these platters. Except for topmost and bottom-most platters, all other platters have data recorded in both sides. In the topmost platter and outermost platter data is recorded only in one side. The spindle rotates clock wise and the head assembly can move linearly. Head assembly place head over appropriate track and the disk rotate and bring the appropriate sector in track under head. Then read or write on that sector is performed.
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