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Processor speed
See Operating speed.
Program
A file that contains coded instructions and tells a computer
what to do and how to do it.
Prompt
A message the screen displays to request information or tell
you what action you need to perform next. See also Command
prompt.
RAM
Random Access Memory. The portion of the computer’s
memory used to run programs and store data while you work.
All data stored in RAM is erased when you turn off or reset the
computer; so you must store any data you want to keep on
disk.
Read
To copy data from one area to another. For example, when you
open a text file stored on disk, the computer reads the data
from the disk and displays it on the screen.
Read/write head
The physical device inside a disk drive that reads data from
and records data on the magnetic surface of a disk.
Real-time clock
A battery-powered clock inside the computer that keeps track
of the time and date, even when the computer is turned off.
Glossary 15