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- A disk is made of one or more platers.
- Each plater is split into tracks.
- Each track is split into sectors (of a fixed size)
- thus outer tracks contain more sectors.
- Each plater may be two-sided, and has a read/write head.
- All read/write heads are handled by a single arm, and thus all
- All tracks that can be accessed at once on all platers (i.e. that sit
at the same distance from the outer edge) are collectively called a