علوم کامپیوتر

The majority of hard drives use a rotating magnetic disk known as a platter to store data.  The actuator moves the arm from the outer rim of the platter to the spindle in order to position the head over the platter where data will be written or read.  When writing data, the head produces a magnetic field that magnetizes the surface of the platter to store data.  The magnetic fields produced by platter can also be read by the head to retrieve data

In order to increase data storage density, most hard drives contain more than one platter.  The platters are stacked on top of each other.  Each platter has a corresponding arm and head for writing and reading data

Solid-state is another type of hard drive.  Unlike rotating magnetic hard drives, solid-state hard drives contain no moving parts.  They are based upon flash memory, which stores data electrically using transistors.  We will discuss use cases for solid-state hard drives later in the white paper.

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