often 100 times cleaner than a hospital operating room, to ensure no contamination. This allows heads to fly at extremely low distances at a few nanometres enabling higher density than in the past.

Design

The magnetic surface of each platter is divided into small sub-micrometer-sized magnetic regions, each of which is used to represent a single bit of information. A typical magnetic region on a hard-disk platter (as of 2006) is about 200-250 nanometers wide (in

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