Hard disk (English: hard disk or hard disk drive HDD abbreviated or shortened hard drive HD) is a hardware component that stores data and includes secondary magnetic disk. Hard disk was first invented by IBM engineers, Reynold Johnson in 1956. The first hard disk is composed of 50 disks measuring 2 feet (0.6 meters) with the rotational speed reaches 1200 rpm (rotation per minute) with 4.4 MB of storage capacity. Hard disks today there are only 0.6 cm wide with a capacity of 750 GB.
If opened, the eye looks at the end of a hard disk bertuas arm attached to the disk that can spin
Data stored on the hard disk will not be lost when the voltage is not given. In a hard disk, there is usually more than one disk to increase the data capacity can be accommodated.
In its development is now a physical hard disk becomes increasingly thin and small but has a data capacity is very large. Hard disk is now not only be installed on the device (internally) but also can be installed outside the device (external) using a USB or FireWire cable.
Source : Wikipedia
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