Epson 3865X Plus - Manual (Page 314)

Current directory
The directory where MS-DOS executes your next command,
unless you tell it to do otherwise (by including a pathname with
the command). Also known as the default or working directory.
Current drive
The disk drive from which MS-DOS executes your next
command, unless you tell it to do otherwise (by including a
drive designator with the command). Also known as the default
drive.
Cursor
The highlighted marker that shows your position on the screen.
Cylinders
The vertical alignment of tracks in a hard disk that can be lined
up under one read/write head. The number of tracks on a disk is
equal to the number of cylinders times the number of heads.
Data
Information such as text or graphics stored or processed by a
computer.
Data diskette
A formatted diskette on which you store data files (as opposed
to program files).
Default
Any value or setting that takes effect when the computer is
turned on or reset. A default value stays in effect unless you
override it temporarily by changing a setting or you reset the
default value itself.