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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 and records
data on the magnetic surface of a disk.
Real-time clock
A battery-powered clock in the computer that keeps track of
the current time and date even when the computer’s power is
turned off.
Reset
To reload a computer’s operating system so you can retry a task
or begin using a different operating system. Resetting erases the
computer’s RAM.
RGB
Red-Green-Blue. A type of color monitor.
ROM
Read Only Memory. The portion of the computer’s memory
that contains permanent instructions and cannot be modified.
The power-on diagnostic programs, for example, are stored in
ROM. Unlike
RAM,
ROM retains its contents even after you
turn off the computer.
Root directory
The top-level directory on a diskette or hard disk. The root
directory is designated by a backslash (\ ). All other directories
are subdirectories of the root directory or of other subdirectories.
Glossary 17