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thumbA disk read-and-write head is the small part of a disk drive that moves above the disk platter and transforms the platter's magnetic field into electric current (reads the disk) or, vice versa, transforms electric current into magnetic field (writes the disk). The heads have gone through a number of changes over the years.

In a hard drive, the heads fly above the disk surface with clearance of as little as 3 nanometres.

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