A hard drive that is outside of the computer case in its own enclosure. Most external hard drives 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.
- external modem
)A modem that resides in a self-contained box outside the computer system. Contrast with an internal modem, which resides on a printed circuit board inserted into the computer. External modems tend to be slightly more expensive than internal modems. Many experts consider them superior because they contain lights that indicate how the modem is functioning. […]
(n.) In a biometric security system, the process of converting a captured biometric sample into data that can be compared to a reference template.
A buzzword that refers to an intranet that is partially accessible to authorized outsiders. Whereas an intranet resides behind a firewall and is accessible only to people who are members of the same company or organization, an extranet provides various levels of accessibility to outsiders. You can access an extranet only if you have a […]
- extrinsic attenuation
In fiber optic transmissions, extrinsic attenuation is one of two main categorized factors that cause attenuation (the reduction of signal strength during transmission). Extrinsic attenuation is caused by external factors, such as a bend in the optical fiber, called microbending or macrobending, which causes a reduction of optical power.
In video editing, an extro is a short video clip used at the end of a disc. Usually the extro is used to display credits. The VCD specification for an extro is four seconds. Contrast with firstplay, the first track on a disc.