Like a large data storage of a computer. Therefore, there must be a relatively high capacity. Internal hard disk will have a round steel plate that is used to record the data layer is stacked and attached to the motor with rotational speed, RPM, with thousands of small arms, the doorbell came. Straight arm will have a head which is used for reading or writing data on a magnetic plate. To read or write data to the hard disk using the change of the magnetic field at the head, the size of the plate that is used with desktop computers, (Desktop) have a diameter of approx. 3.5-inch hard disk, if it is a section of your notebook, it approx 2.5 inches.
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