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CD/DVD data carriers
The CDs/DVDs available in the market correspond to different
standards. Not every CD/DVD can be read by every optical drive.
CD-ROM
Abbreviation for “ C ompact D isk - R ead O nly M emory”. A CD
ROM is a CD storage medium, on which up to 700 Mbytes of
digitised data is stored. However, this data cannot be changed
and can only be read by an optical drive. In principle, CD-ROMs
are read in the same way as audio CDs but cannot be used in
audio equipment.
CD-R
Abbreviation for " C ompact D isk R ecordable". A CD-R can only
be written once. Once a CD-R has been finalised, it is no longer
possible to delete or edit the content of the CD-R.
CD-RW
Abbreviation for " C ompact D isk R e W ritable". A CD format that
allows you to write to a CD any number of times using a CD-
RW drive. You can then read the information as often as you
wish. The CD-RW can be compared to a floppy disk, as it can
be used for the repeated storage of data.
Not all older optical drives can read CD-RWs.
DVD
Abbreviation for " D igital V ersatile D isk" or " D igital V ideo D isk".
A DVD is a storage medium, similar to a CD, but with a higher
memory capacity, which is achieved by narrower tracking. A
DVD can be used in two positions, and on both sides
(depending on the type), which means that the memory
capacity can be 25 times that of a CD.
Because of the high memory capacity, DVD is particularly well
suited for digitised films with additional features such as
different languages or subtitles.
For DVD films, so-called regional codes were introduced in
1997, which are intended to prevent e.g. US DVDs from being