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external hard drive
Last modified: Thursday, May 03, 2007 


A hard drive that is outside of the computer case in its own enclosure. Most support the IDE interface and are slightly bigger than a hard drive itself. When purchasing an external hard drive you can buy a full external hard drive system that consists of both the hard drive and the enclosure, or you can purchase just the enclosure to hold your own hard drive. External hard drives may contain a fan for cooling and are popular because they are portable devices and can be stored securely under lock and key since they are not inside the computer case. An external hard drive is connected to the computer system with a single high-speed interface cable, usually with plug-and-play interfaces such as USB or FireWire.

Hard drive enclosures, also called hard drive cages are made to support up to a certain physical size of hard disk, so you need to check the manufacturer's specification when buying just the enclosure.

See hard disk drive.
Also see What's Inside a Hard Drive? in the Did You Know . . . ? section of Webopedia.

  Related Links

HardwareCentral
Resource site offering news and information about PC hardware elements. Includes timely feature articles and sections on optimization and troubleshooting.

Sharky Extreme
Reporting on the latest hardware and software technology for the PC enthusiast.


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ATA

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hard drive enclosure

harddrive

hardware

IDE

optical disk

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USB

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