Digital Equipment 300 Series AXP Reference Manual page 285

fixed disk
A disk that resides permanently inside a disk drive. Compare
with diskette.
fixed disk drive
The drive that holds and reads from or writes to a fixed disk.
frame buffer
An area of memory that contains a pixel-level description of a
displayed image. The frame buffer is also used to refresh the
raster display.
gigabyte (GB)
The measure used to refer to memory or secondary storage
capacity, equal to 1,024 megabytes or 1,073,741,824 bytes.
graphics
The use of lines, figures, shapes, and shaded areas to display
information.
graphics heads
Multiple monitors connected to one system unit through the use
of a second and third graphics module.
ground
A conducting connection to an electrical circuit that is at zero
potential relative to the earth; a voltage reference point that has
a zero voltage potential. Ground should be at the same potential
as neutral. Each dedicated circuit should contain a neutral and
green ground wire.
half-height disk
Any 1 5/8-inch fixed drive that is 3½ inches (9-centimeters) wide,
such as those in the RZ family; or a 1 5/8-inch removable drive
that is 5-inches (12.7-centimeters) wide, such as a compact disc.
Glossary–13