2011

98 Glossary
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are also considered hardware, i.e. printer, scanner, monitor, etc. The
synchronization of single hardware components is coordinated by the
software.
HD DVD
The HD-DVD is intended for playback on HD-DVD players and cannot be
played on normal DVD players. By default it is created in "1080i" (1920 x 1080
pixels) format. The amount of data is four-times that of normal DVD formats.
Advice: Toshiba declared at the beginning of 2008 that the manufacture and
further development of the technology (including devices) would be stopped.
This makes Blu-ray the official successor to the DVD.
HDD
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).
I
Image
An image is a representation of a CD, DVD, hard drive, or another storage
medium that is saved as a file.
The difference from a copy or backup is that an image contains information
about the structure of the original storage medium, and not just individual files.
This enables 01:01 copies of complete storage media to be created.
Caution! Copyright laws forbid copying of commercial CDs/DVDs, and for this
reason, this process can be prohibited by copy protection.
IRQ
IRQ stands for "Interrupt Request". This interrupts running programs in order to
complete other tasks with a higher priority. The command sent to the
processor for this interruption is called an IRQ. The reason for these
interruptions is to enable input and output devices such as mice, keyboards
and hard drives to react quickly.