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Compare disc. See also hard disk. disk drive — The device that reads and writes information and programs on external media or hard disk. It rotates the disk at high speed past one or more read/write heads. Glossary 212 document — Any file created with an application and, if saved to disk, given a name by which it can be retrieved. See also file. double-click — To press and release the pointing device’s primary button rapidly twice without moving the pointing device. In the Windows® operating system, this refers to the pointing device’s left button, unless otherwise stated. download — (1) In communications, to receive a file from another computer through a modem or network. (2) To send font data from the computer to a printer. See also upload. drag — To hold down the mouse button while moving the pointer to drag a selected object. In the Windows® operating system, this refers to the left mouse button, unless otherwise stated. driver — See device driver. DVD — An individual digital versatile (or video) disc. See also DVD-ROM. DVD-ROM (Digital Versatile [or Video] Disc Read-Only Memory) — A very high-capacity storage medium that uses laser optics for reading data. Each DVD-ROM can hold as much data as several CD-ROMs. Compare CD-ROM. E emulation — A technique in which a device or program imitates another device or program. enable — To turn on a computer option. See also disable. eSATA — An external device that supports hot swapping and fast data transfer. Very useful in storing and transferring large files. executable file — A computer program that is ready to run. Application programs and batch files are examples of executable files. Names of executable files usually end with a .bat or .exe extension. expansion device — A device that connects to a computer to expand its capabilities. Other names for an expansion device are port expander, port replicator, docking station, or network adapter. extension — See file extension. external device — See device. Glossary 213 F G H file — A collection of related information, saved on disk with a unique name. A file may be a program, information used by a program, or a document. See also document. File Allocation Table (FAT) — The section of a storage drive that keeps track of the location of stored files. file name — A set of characters that uniquely identifies a file within a particular folder. It consists of two parts: the actual name and the file name extension. See also file extension. file extension — The three characters following the period (pronounced “dot”) at the end of a file name. The extension indicates the type of file. Examples are .exe for program files and .hlp for help files. See also file name. folder — Also called directory. A container for organizing files saved to a disk. A folder is symbolized on screen by a graphical imag...

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