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Glossary
DVD-RAM
– DVD-Random Access
Memory
A DVD that enables writing, erasing, and rewriting of data. Supported as a standard feature on
Windows XP. The type of disk most commonly used with DVD recorders, can be rewritten about
100,000 times.
DVD-ROM
– DVD-Read Only
Memory
A DVD that only enables data to be read. It enables recording of 7 to 25 times the volume of
data on a CD-ROM. Because of their large capacity, DVD-ROM disks are mainly used for
games or other applications that require large volumes of data, such as pictures and maps.
DVD-RW A DVD that enables writing, erasing, and rewriting of data. Data can be rewritten about 1,000
times.
DVD-Video A DVD on which audio and video are recorded using MPEG2 (Î page 167), which offers high
playback quality with digital video compression technology.
DVD-video disks can be played back using WinDVD, which is installed on this computer.
E
Encryption Changing data into a form that cannot be understood by others. A rule (algorithm) and a key
(network key) for converting data between a sender and a receiver are determined, and the
data converted (encrypted) by the sender is returned to its original form (decrypted) by the
receiver. In this way, important interactions cannot be deciphered by others.
ESS-ID
– Extended Service Set ID
A text string that identifies the sender when using wireless LAN. Since communications use
wireless LAN radio waves, data can be exchanged with a large number of networks. Each
computer or access point (Î page 158) confirms this text string, allowing communications only
between parties with matching ESS-IDs.
D
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