User manual

74 Glossary
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Double-layer
DVDs can consist of one or two storage layers, and both of these can be
written to. Video DVDs increase the capacity up to 4.5 or 8.5 GB.
During the write and read process, each layer can be accessed without
damaging data on the other layer. One of the biggest challenges of
development of this medium was making normal DVD players able to playback
these discs.
Drag & drop
Enables files and objects to be moved freely between various applications (or
within an application) by dragging the object and letting it drop using the
mouse cursor.
F
Firewall
A firewall is a technical system for protection against unwanted external access
or hacker attacks.
There are hardware and software firewalls. Hardware firewalls are mostly
technical devices with network interfaces (for example, router or proxy), and
are therefore sometimes called network firewalls. Software firewalls run as a
program on an operating system and control outgoing file traffic as well as
attacks from the web. They also protect against unwanted secret sending of
data from the computer by other programs.
Note: It may come to a blockade of communication between programs or
processes in your own system if your security level is set too high.
H
Hard disk
Storage medium with the largest storage capacity where the operating
system(s), programs, and files are saved. A hard disk can be built into the
computer, but there are also external hard disks which can be used with
different computers via a USB connection (portable drives or external hard
disk).
Hard disk drive
Storage medium with the largest storage capacity where the operating
system(s), programs, and files are saved. A hard disk can be built into the
computer, but there are also external hard disks which can be used with