Sony DVD Rom/DVD Video User Manual download pdf (Page 11)

1. General

Compared to the DVD 9, the additional capacity of the

DVD 10 is about 900 MegaByte (just a little more than

the capacity of one CD) but the disadvantages may

increase, depending on your application.

One reasonable application may have the same content

on Side A and on Side B but in different formats, like

one in PAL (Phase Alteration Line) and one in NTSC

(National Television Systems Committee).

From the production’s point of view, the DVD 10 is very

similar to the DVD 5, with the only difference being that

both discs do contain data and they are adhered back

to back. Both reflective layers are made of aluminum.

1.5 DVD 18

This ”Dual Layer Dual Side” Digital Versatile Disc

(DVD) has a maximum data capacity of about 17,1

GigaByte. This is exactly twice the capacity of a DVD 9.

The picture above shows the principal structure of a

DVD 18. As it can be seen, there are two layers per

side, one semi-reflective and one fully reflective similar

to the DVD 9.

In terms of handling, this kind of DVD does have the

same disadvantages as the DVD 10. Due to the fact

that only a few players in the market have the capability

to read from both sides, it is very inconvenient for users

to turn the DVD over while the movie or programm is

running. In addition to this inconvenience it is also not

possible to use any side of the DVD for large prints

since the laser reads from both sides (for further infor-

mation please see chapter 4 of this document).

From the production point of view, the DVD 18 is the

most complicated disc.

0.6 mm

1st side/1st layer

2nd side/2nd layer

2nd side/1st layer

1st side/2nd layer

DVD 18 • 17 GigaByte • Double Side/Dual Layer

The stampers are made during the same process as

the DVD 5. After the polycarbonate discs have been

produced in the die-casting machines, the first layer

has been built up by the polycarbonate. This layer is

sputtered with silicon (like it was with the DVD 9 for the

first layer with approximately 20% reflection). Then a

special developed liquid UV resin is applied onto the

silicon layer. Then another stamper containing the pit

pattern (information) for the second layer is pressed

onto the applied liquid. After the liquid resin has dried,

Aluminum is sputtered onto this information-layer and a

special adhesive is applied, which glues two similar

fabricated discs together. Finally, there are four layers of

information and roughly 17,1 GigaByte of data. Since

the DVD 18 has little application, Sony DADC does not

offer this niche-product.

1.6 MiniDVD

The MiniDVD is the small DVD for the big ideas.

Compared to normal DVDs (diameter of 12 cm), this

DVD has a diameter of only 8 cm. There are two diffe-

rent kinds of MiniDVD: The ”Single Layer Single Side”

DVD which holds approximately 40 minutes of film (1.46

GigaByte) and the ”Dual Layer Single Side” DVD with

approximately 75 minutes of film-material (2.66 Giga-

Byte).

This MiniDVD is the ”little sister” of the conventional

DVD. With the main difference being its smaller size, it

is much more convenient to send via the post and the-

refore the ideal ”transport-media” for promotion mate-

rial such as corporate videos, multimedia presentations,

film trailers and more. It has roughly twice the capacity

of a CD-Rom but being much lighter and more attrac-

tive through the special appearance.

Therefore the MiniDVD is the real product for

Promotions and Company Presentations.

From the production point of view, there is not a big

difference to the 12 cm DVDs apart from the different

diameter.

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Sony DVD Rom/DVD Video User Manual Page 11

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