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| Border out Area: |
Marker at theSequential Recording writing modus of
DVD-RW Recorders, which is generated anew at the end
of each writing session and which marks a temporary
Lead out. |
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| CLV (Constant Linear Velocity): |
| Varying rotation speed of the media, where the relative
speed between laser beam and data track remains constant inside as
well as outside. |
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| DVD Forum: |
| International community of companies producing DVD media and hardware.
It was founded in 1995 as a DVD consortium by Hitachi, Matsushita,
Mitsubishi, Philips, Pioneer, Sony, Thomson Multimedia, Time Warner,
Toshiba Corporation and Victor. The purpose of this organisation is
to create consistent standards for DVD products and to sponsor them
worldwide. Today 230 companies belong to this organisation. |
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| DVD-R(G): |
| DVD-R for general media has been developed for the consumer market
and costs approximately 15 Euro per piece. The wave length of the
laser beam is 650 nanometer, which is greater compared to the DVD-R(A),
which makes copying of films impossible. |
| |
| DVD-R Recorder: |
| DVD-R recorders for home entertainment are available since the end
of 1997. In comparison to other recorders, Organic Dye
is used as for the recording procedure. The applied writing method
is Wobbled Groove. The DVD-R recorder does not accept
all blank media. It only accepts DVD-R's. The recorder
is more flexible regarding reading. Including its own formats DVD-R
and DVD-RW, it can also read DVD videos, DVD-ROM's and
with limitations DVD+RW media. |
| |
| DVD-RAM recorder: |
Unlike DVD-RAM media which are not compatible with
other recorders, the DVD-RAM recorder offers the best compatibility
with other DVD formats. Including DVD-RAM's,
DVD-R-media, DVD videos, with limitations DVD-ROM's,
CD-R's and CD-RW's can be played. As regards recording, the RAM drives
are not restricted to DVD-RAM media,
but also work with DVD-R's. |
| |
| DVD+RW Recorder: |
DVD+RW recorders for PC and home entertainment usage are available
on the market since the end of 2001. DVD+RW recorders can read all
formats except DVD-RAM. There are two further restrictions:
DVD-R or DVD-RW can only be used in a
DVD+RW recorder, if they can be read by a DVD-ROM drive at the same
time. Including DVD+RW media, CD-R and CD-RW-media can
also be recorded. Due to the background formatting technology which
is being used for DVD+RW recorders, the time-consuming formatting
of the media before the actual recording session with
DVD-RW recorders is no longer applicable. In only two minutes
the media is pre-formatted and afterwards, during recording, formatted
further in the background. Due to the so called Lossless Linking the
DVD+RW recorder is the ideal successor of the video recorder. As writing
method the DVD+RW recorder uses the method High Frequency Wobbled
Groove, whereby media can not only be recorded in the CLV-
but also in the CAV mode. |
| |
| High Frequency Wobbled Groove: |
| Writing method of DVD+RWrecorders , which only records
data on the DVD+RW media in the groove between two sinus
shaped and highly frequented data tracks. Therefore blank media, in
opposition to other media, can be recorded with constant angular velocity
(CAV) or with variable velocity (CLV).
|
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| Lossless Linking: |
| Function of the DVD+RW recorders, which allows addition
or deleting data anytime on a DVD+RW disc, which has
already been written on and removed from the drive, without creating
a gap between the old and the new data. The chance is relatively high
that the DVD+RW recorder will sooner or later replace
the home video recorder. |
| |
| Phase Change Procedure: |
| Recording procedure of DVD-RAM, DVD-RW
and DVD+RW devices, with which the laser heats the metal
alloy in a first performance level to 200 degrees, so that the atoms
arrange themselves crystalline in-between the alloy and receive a
high reflection degree (delete), which remains with a slow cooling.
A second laser performance level then heats the alloy to 500 to 700
degree Celsius and thereby places the atoms in a disordered state.
Due to a fast cooling phase this amorphous state with low reflection
degree does not change itself. The succession of parts with low and
high reflection degree is equivalent to the succession of Pits
and Lands. |
| |
| Sequential Recording Mode: |
| Writing modus of the DVD-RW media with which the recorder
produces a so called Border Out Area at the end of each
writing session, which marks a temporary stop. Newly added data will
get a new Border Out Area, while the earlier recorded
part will be ignored by other drives. |
| |
| Wobbled Land and Grooves: |
| Writing procedure which is being used for DVD-RAM's. The laser beam
follows alternately the pre-pressed pits (grooves) and the ridges
(land). Due to this unequal level of height of the recorded data,
the gap of the data parts laying next to each other is being enlarged
which reduces the possibility of reading mistakes. Hence it is possible
to arrange data tracks more densly than with other reading processes
which increases the data capacity significantly. |
 |
|
|
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| CAV (Constant Angular Velocity): |
| Constant rotation speed of the media which generates a constant
data transfer rate through an unequal sector size. Thereby non-linear
video recordings can also be saved onto fragmented DVD+R media. |
| |
| DAO (Disc at once): |
| Procedure which is used to record data on DVD-R media
where the laser writes the Lead out, the data and the Lead in without
interruption. DVD (Digital Versatile Disc): Generic term for all storage
media in DVD format. It includes DVD videos as well as once writable
and re-writable blank DVD media. DVD's are sold in the home entertainment
and PC shops or departments. |
| |
| DVD-R (Recordable): |
| Once writable DVD media which can store 4,7 GB single sided and
9,4 GB double sided. This media are compatible with almost all DVD
drives and players. |
| |
| DVD-R(A) |
| : DVD-R media with the identification
code "A" for Authoring are defined for the professional user, which
also affects its price which includes the license fees. The wave length
of the laser beam which burns a DVD-R (A) is 635 nanometer. |
| |
| DVD-RAM: |
| The DVD with Random Access Memory has been developed by Toshiba,
Panasonic, Hitachi and Matsushita and was launched in 1998 in four
different types. Due to of the fast access time and the possible implementation
into an operating system like a hard disc, the DVD-RAM is the perfect
back-up storage media for PC users in the professional IT sector.
Since the media is also available in a Cartridge, it also offers the
best protection against scratches. |
| |
| DVD+RW alliance: |
| Sony, Philips, Yamaha, Mitsubishi, Ricoh and Thomson joined together
to develop this format. In the meantime, Dell, Hewlett Packard and
Memorex have joined this consortium. |
| |
| DVD+RW: |
| Up to 1000 times writable media with a single sided storage capacity
of 4,7 GB, but with a different recording procedure from the DVD-RW
media. The DVD+RW is compatible with approx. 80% of all DVD-ROM drives
and DVD players. |
| |
| DVD-RW: |
| This format was developed by Pioneer single-handedly, which in the
meantime is being offered by other companies such as Acer, Apple,
Compaq or Packard Bell. A DVD-RW can be re-written at least a 1000
times and can store up to 4,7 GB. The blank media must be formatted
before the burning session - with a 4,7 GB media that takes approximately
45 minutes at a single DVD speed. Generally the DVD-RW media can be
played in about 70 percent of all DVD players, DVD-ROM drives and
CE devices. |
| |
| DVD-RW recorder: |
| DVD-RW recorders are available on the market since the end of 2000.
The -RW technology works with the Restricted Overwrite
mode as well as with the Sequential Recording mode.
For video data the DVD-RW format additionally comes with an extended
instruction set for cutting commandss, the video recording format
(VRF). Including DVD-R's and DVD-RW's
the DVD-RW recorder can also write CD-R's and DVD-RW's. |
| |
| Lead in: |
| Directory of the DVD, which lays on the inmost four millimeters
of the recording area. |
| |
| Lead out: |
| Mark which indicates the outer end of the recording area in the
last millimeter of the DVD. |
| |
| Organic Dye: |
| Colour layer which is transparent for blank CD media and purple
for blank DVD media. Due to the heat of the laser beam the organic
colour layer changes to a darker colour and reflects the laser beam
less than on the transparent parts. The structure of less reflecting
and more reflecting parts corresponds to the series of Pits
and Lands on pressed DVD's. |
| |
| Pits and Lands: |
| Succession of parts with low and high reflection degree, which develop
in the Phase Change through the different temperatures
of the laser beam and the following cooling. Parts with a lower reflection
degree consist of subordinate atoms and parts with a high reflection
degree corresponding to an ordered or crystalline order of the atoms. |
| |
| Restricted Overwrite Mode: |
| |
| Writing modus, which is used for DVD-R and DVD-RW
media and which, through pre-formatting of the media, reduces the
amount of unwritten parts for the benefit of better writing performance.
|
| |
| VRF (Video Recording Format): |
| |
| Special DVD-R / -RW format, which additionally comes
with extended information for cutting instructions for video data.
This format enables the user to edit his recorded sequences, for example
to delete commercials in the recorded data. However if the user takes
advantage of this VRF technology, a great part of the DVD player compatibility
gets lost. |
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