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DC flows in one direction. Compare alternating current (AC). direct memory access (DMA) — A dedicated channel, bypassing the CPU, that enables direct data transfer between memory and a device. directory — See folder. disable — To turn a computer option off. See also enable. disc — A round, flat piece of material, designed to be read from and written to by optical (laser) technology, and used in the production of optical discs, such as CDs and DVDs. Compare disk. disk — A round, flat piece of material that can be magnetically influenced to hold information in digital form, and used in the production of magnetic disks, such as diskettes and hard disks. Compare disc. See also diskette, hard disk. disk drive — The device that reads and writes information and programs on a diskette or hard disk. It rotates the disk at high speed past one or more read/write heads. diskette — A thin, flexible disk in a protective jacket that stores magnetically encoded data. Diskettes can be removed from the computer and come in two sizes: 5.25-inch and 3.5-inch. Your computer uses 3.5-inch diskettes. See also double-density diskette, high-density diskette. document — Any file created with an application and, if saved to disk, given a name by which it can be retrieved. See also file. Glossary Glossary 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. double-density diskette — A 3.5-inch diskette that can hold up to 720 KB of information (half the capacity of a high-density diskette). See also diskette, high-density diskette. 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 cursor 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 DVDROM. 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. 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 ...

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