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A track is a collection of sectors arranged in a circumferential circle on a platter surface. On the surface of a metal cylinder, they keep data in the form of magnetic dots in nearby circular grooves.

What is concentric circles ?

One to 200 tracks can fit on a single drum. As the drum rotates at around 3,000 revolutions per minute, heads placed close to its surface record and read data. The disc is split into numerous concentric circles called tracks, and tracks are further divided into sectors, which are where data is stored. Tracks are a series of concentric circles or rings used to format disc platters. Sectors within each track divide the circle into a series of arcs, each designed to hold the same information.

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