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magnetic disk
A flat rotating disc covered on one or both sides with magnetisable material. The two main types are the hard disk and the floppy disk.
Data is stored on either or both surfaces of discs in concentric rings called "tracks". Each track is divided into a whole number of "{sectors}". Where multiple (rigid) discs are mounted on the same axle the set of tracks at the same radius on all their surfaces is known as a "cylinder".
Data is read and written by a disk drive which rotates the discs and positions the {read/write heads} over the desired track(s). The latter radial movement is known as "seeking". There is usually one head for each surface that stores data. To reduce rotational latency it is possible, though expensive, to have multiple heads at different angles.
The head writes binary data by magnetising small areas or "zones" of the disk in one of two opposing orientations. It reads data by detecting current pulses induced in a coil as
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