device called actuator. Each platter has two heads, one on the top of the platter and one on the bottom, so a
hard disk with three platters would hav
e six surfaces and six heads.
Data is recorded onto the magnetic surface of the disk in exactly the same way as it is on floppies. How-
ever, a disk controller is attached to the hard disk drive that handles the read/write commands issued by
the operating system. Each read/write command specifies a disk address that comprises the surface number,
track number, and sector number. With this information, the read/write head moves to the desired sector
and data can be read ...
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