HP Compaq Presario,Presario 5000 User Manual page 218

joystick A lever that moves in all
directions to control the movement of a
pointer or objects on the screen. It is used
for computer games in which you drive,
fly, or shoot objects displayed on the
monitor.
JPEG (pronounced J-peg). A file format for
graphics, especially photographs,
displayed on the Internet. It is easily
identified by the file extension .jpg. JPEG
files, which store more information per
pixel than GIF files, are used for complex,
high-resolution images. See GIF. See also
pixel.
lead-in An area at the beginning of each
session on a recordable session that is left
blank for the session's table of contents.
The lead-in is written when a session is
closed, and takes up 4500 sectors,
approximately one minute, on a CD. The
lead-in also contains the next writable
address on the CD so that future sessions
can be added, unless the CD is closed.
lead-out An area at the end of a session
which indicates that the end of data has
been reached. The first lead-out on a CD is
6750 sectors long. Any subsequent lead-
outs are 2250 sectors, or about 30 seconds.
link See hyperlink.
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link block A block, also known as a sector,
of digital rubbish that is written each time
the recording laser is turned on (before) or
off (after) writing a track or a packet. See
also Run-in/Run-out Blocks.
linked multi-session A CD containing
more than one session, in which all (or
selected) data from the various sessions
can be seen as if they had been recorded in
a single session.
listserv See mailing list.
logical block The smallest addressable
space on a CD. Each logical block is
identified by a unique Logical Block
Number (LBN), each of which is assigned
in order starting from 0 at the beginning of
the CD. Under the ISO 9660 standard, all
data on a CD is addressed in terms of
Logical Block Numbers.
logical format/logical structure/file
system A file system, such as ISO 9660,
that translates the sector-by-sector view of
a CD into a virtual tree of directories and
files. This system makes it easier for both
people and computers to use the
information on the CD. UDF is another
example of a file system that can be used
to write CDs.
log on To gain access to a computer
network or the Internet by entering a user
name and password. See network.
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LOSSARY