3. DISK In Operating SYSTEM


3. DISK
● Next in the hierarchy is magnetic disk (hard disk).
A disk consists of one or more metal platters that rotate at 5400, 7200, 10,800 RPM or more.
● A mechanical arm pivots over the platters from the corner, similar to the pickup arm on an old 33-RPM phonograph for playing vinyl records.
● Information is written onto the disk in a series of concentric circles.
At any given arm position, each of the heads can read an annular region called a track.
Together, all the tracks for a given arm position form a cylinder.
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