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Disk drive
The physical device that allows the computer to read from and
write to a disk. A diskette drive has a disk slot into which you
insert a diskette. A hard disk is sealed inside a protective unit.
Diskette
A flat piece of flexible plastic coated with magnetic material
and used to store data permanently. Also called floppy disk.
Display adapter
The card that is installed in one of the computer’s option slots.
The display adapter provides the interface to which you
connect the monitor and controls the way the monitor displays
text and graphics. Also known as video card.
DOS
The Disk Operating System that controls the computer’s input
and output functions. See Operating system.
Double-density
A type of diskette format that allows you to store twice as much
data as the standard-density format. A 5 1/4-inch double-
density diskette can store 360KB of data. A 3 1/2-inch double-
density diskette can store 720KB of data.
Drive designator
The letter name of a disk drive, followed by a colon-for
example, C:.
EGA
Enhanced Graphics Adapter. A type of adapter that allows
you to display high-resolution graphics on a color monitor. It
can display up to 43 lines of text with 80 characters on each
line, or it can display monochrome or 16-color graphics at up
to 640 x 350 resolution.
6 Glossary