Dvd | Sony DVD Rom/DVD Video guide

However, the two most commonly used DVDs are the DVD 5 and DVD 9. These single sided discs bring a maximum of comfort to the home-cineast combined with high data storage capatility.

Single Side DVDs	Single Layer	Dual Layer
Data Capacity
DVD	4.7 GB	8.54 GB
MiniDVD	1.46 GB	2.66 GB
Wavelength of laser diode	650 nm	same
Minimum pit length	0.5 µm	0.44 µm
Track pitch	0.75 µm	same
Disc thickness	2x 0.6 mm	same
Disc center hole	15.0 mm	same
Reflectivity	45-85%	18-30%
Reference scanning velocity	3.49 m/sec	3.84 m/sec
Maximum user bit rate	11.08 Mbps	same

Since DVD10 and DVD 18 are read from both sides, there is the disadvantage of having to turn these DVDs in most of the players. Additionally, there must not be large prints on the top or bottom side (due to legibility). Only small printing areas are allowed (please find detailed information in chapter 4 of this manual).

1.2DVD 5

The DVD 5 is a ”Single Layer Single Side” Digital Versatile Disk (DVD), with a storage capability of 4,7 GigaByte. This capacity is sufficient to record a 130 minute long movie with one audio stream.

The picture below shows the principal structure of a DVD 5. As it can be seen, there is just one layer, which is read from one side.

DVD 5 • 4,7 GigaByte • Single Side/Single Layer

0.6mm

1st side

The DVD 5 is to be named ”The entrance of the World of DVD”. Its capacity is clearly higher (approximately seven times) than that of a Compact Disc (CD) but still far behind in the real DVD-possibilities (accomodating up to seventeen GigaByte.

Yet this DVD 5 – Video is the right product for ”classic” titles without features, like different languages, scenes of ”The Making Of”, actor interviews, various camera positions or interactive movies.

From the production’s point of view, there are several		General
In the field of movie business, the purpose of DVD 5 is
more or less to substitute VHS – formats and to
increase the comfort of watching movies at home,
combined with high durability.
procedures necessary. Firstly, the so-called ”glass		1.
master” has to be produced. After a special developer
(photo-lacquer) has been applied onto a glass-plate,

the microstructure for the DVD has to be burned by
a special laser writer. Subsequently this glass master
is coated by nickel to get a nickel foil with the micro-
structure.
The removed nickel-layer (called father) could already
be used as a stamper in the replication machines.
But for trough-put reasons, copies (stamper) have to
be made with the help of a negative-print of the father
(which is called mother). Afterwards these few stampers
are used in die-casting machines to produce 0,6 mm
thick polycarbonate discs, which have the final
structure of the DVD. To be readable by a laser light,
these polycarbonate discs have to be coated by
reflective layers. Consequently aluminum is sputtered
onto the polycarbonate substrate containing the right
information.
Within the next production step two discs are bonded
together to get the final thickness of 1,2 mm. But
because of the one layer data structure of the DVD 5,
only the bottom disc contains information. The top disc
is just a plain disc with no information.
Finally there is one disc with one readable layer
and a thickness of 1,2 mm with a data-volume of max.
4.7 GigaByte.
1.3	DVD 9

The DVD 9 is a ”Dual Layer Single Side” Digital Versatile Disc (DVD), with a storage capability of 8,5 GigaByte. In fact, both layers are read from one side. Due to the ”Through-Reading-Process” the data-struc- ture of the second layer is a little bigger, which causes less capacity than on the first layer. Therefore the total ability is given with 8,5 GigaByte and not twice the capacity of a DVD 5 (which is 4,7 GigaByte x2 and would be equal to 9,5 GigaByte).

DVD 9 • 8,5 GigaByte • Single Side/Dual Layer

0.6mm


1st layer						2nd layer