Disk structure - Wikipedia

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Disk

      A disk is physically composed of a series of flat, magnetically coated platters that are stacked on a spindle.

eg: CD-ROM.

Disk Structure

      A Disk Structure is collection of disks.The collection of these disk is called hard disk or hard device.A disk device has physical components and logical components. The physical components include disk platters and read/write heads. The logical components include disk slices, cylinders, tracks.

Disk Structure

Disk Structure

      A disk is accessed as an array: sector 0 is the first sector of the top track of the outmost cylinder.

The next sectors of the same track are then ordered. Then, sectors from the next track are ordered. After all the sectors of all the tracks are ordered, we move to the next cylinder. The innermost is the last cylinder.