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Source diskette
The diskette that you are copying files from, as opposed to the
target diskette, which is the diskette you are copying files to.
Stop bit
A signal sent in serial communications to mark the end of a
character.
Subdirectory
A disk directory that branches down from another subdirectory
or from the root directory.
Switch
An option added to an MS-DOS command that affects the way
the command works. See Parameter.
System diagnostics
A set of programs you can run to verify the integrity of the
computer’s hardware components. See Appendix D.
System diskette
A diskette from which the operating system can be
booted. An MS-DOS system diskette must contain the file
COMMAND.COM plus two hidden MS-DOS program files.
To create a system diskette, use the /S switch with the
FORMAT command (for example, FORMAT A: /S).
Target diskette
The diskette that you are copying files to, as opposed to the
source diskette, which is the diskette you are copying files from.
TPI
Tracks Per Inch. A measure of the density with which data can
be stored on a diskette.
Track
A circular region on a diskette, which is divided into sectors.
Each side of a 1.44MB or 720KB diskette has 80 concentric
tracks. Each side of a 360KB 5 1/4-inch diskette has 40. On a
hard disk, tracks are called cylinders.
Glossary 15