A hard drive is an essential part of the hardware for each computer, is actually the name of Hard Disk Drive (HDD), other names are the most common hard disk and hard drive. A hard drive is a non-volatile data storage, with two rotating discs, as the dishes are known to have magnetic surfaces, the hard drive stores digitally encoded data. While the hard drives of today are a completely sealed unit (exceptVentilation holes), had the original disks, removable media. The term "hard" was intended as a substitute, temporary slang, the term "rigid", before it was decided a common name. A hard disk is, in substance, but the name is used only rarely.

The disks have been introduced for storing data in an accounting computer in 1956 and for general-purpose computers have been developed. Nonvolatile memory meansUnlike RAM, which is a volatile memory, the information is not deleted when the computer is off. The disc is in the firmware and program files are stored together with other types of information so they can always be accessible.

The dates are stored in the computer language, such as a binary code, the information is recorded as a series of zeroes and ones and is available through the detection of magnetized material. Covered with a thin layer of magnetic material, thePanels themselves are usually non-magnetic aluminum or glass. Discs previously used for the magnetic material of iron oxide, but is now used a cobalt-based alloy.

A typical hard disk of a desktop computer somewhere has 120-500 GB of digital data, rotate at 7200 rpm (revolutions per minute), the 1 Gb per second. Since July 2008, the largest capacity hard drive was a 1.5 TB, with a speed of 10 thousand and 15Thousand and a transfer rate of 1.6 Gbit per second. RPM hard disk with at least 10 thousand have the choice of the player to their computer, because the high data rates, the costs of starting the game time and reduces cuts loading times.

Modern Hard days include a variety of digital applications such as video recorders, audio players, personal assistants, cameras and game consoles. Samsung and Nokia have hard drives to theirMobile phones for the first time in 2005 and has revolutionized the market. The size of the disk remains the same, but the amount of data stored on them is increasing because of research data compression. The original disc instead of 4.4 megabytes (MB) of digital data in comparison to the hard drive that later can still hold more than 3 terabytes (TB) of digital data. (1 thousand bytes = 1 MB, 1 thousand MB = 1 gigabyte (GB) 1A thousand GB = 1 TB) 3-GB hard drives are not yet available for purchase to the public, but the 2 TB external hard drives, and sold for a minimum of $ 454

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