External hard drive
A hard disk drive (HDD) stores information as magnetization patterns on magnetic media and are common components in today's personal computers. An HDD is generally used as a complementary memory device in which a head hovers a minute distance above a turning magnetic disk, data is magnetically recorded on or read from the disk, and a large volume of data can be accessed at a high speed. Hard disk drives are especially useful in situations where a user may need to access a relatively large amount of data reasonably quickly, for example, as compared with accessing an archived tape copy. This use is becoming even more commonplace as hard disk drives become increasingly cheaper while providing a larger storage capacity. A hard drive combines and includes a head disk assembly (HDA) made up of mechanical components, and a printed circuit board assembly (PCB) made up of circuit components. A computer hard drive typically includes a rotating magnetic disk and a read/write head supported adjacent one side of the disk for approximately radial movement relative to the disk. Data on the disk is organized in the form of a plurality of concentric tracks, each track being subdivided into a plurality of arcuate sectors that are circumferentially distributed. Each track also includes servo information which can be read by the read/write head. The external hard disk drive typically has the same structure as that of a hard disk drive internally mounted in the computer system. The main unit of the hard disk drive is covered with a metal sheet to control EMI (Electromagnetic Interference), and is then housed in a case fabricated of a resin. An external hard disk drive is connected to a computer through a cable compatible with the Small Computer System Interface (SCSI), Integrated Development Environment (IDE), Universal Synchronous Bus (USB), IEEE 1394 (Firewire), or other bus standards.
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