VIDEOLIB Archive: RE: [Videolib] Looking for technical information

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Hi Val,
=20
I found a short article in the "How It Works" series which might be =
helpful for your first question:
=20
"DVD-Rs contain a clear layer of an organic material that is transformed =
into a colored dye when activated by the writing laser in an appropriate =
DVD drive. The points of dye left by pulse of the writing laser are then =
read by a low-power laser in the way that the pits of a standard DVD are =
read. Since the activated dye cannot be returned to its original clear =
state, a given DVD-R can be written only once."
=20
Source: "Recording on DVDs." How It Works: Science and Technology. Vol. =
3. New York: Marshall Cavendish,=20
2003.
=20
Hope this helps,
=20
Ameet
=20
=20
Ameet Doshi
Resident Librarian=20
College of DuPage Library
Glen Ellyn, IL=20
(630) 942-2383
doshia@cdnet.cod.edu

From: videolib-bounces@library.berkeley.edu on behalf of Val Gangwer
Sent: Fri 7/8/2005 11:13 AM
To: videolib@library.berkeley.edu
Subject: [Videolib] Looking for technical information

Hello all,
I am looking for information on the actual burn process for DVDs. I was =
told
that these discs have a dye layer that is altered to make the copy. =
First,
is that right? Second, do all home burning discs work the same way?
Thanks for any light you can shed.
Val

Valerie Gangwer
Director of Audiovisual Services
Mary Baldwin College
540-887-7084

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=0A= =0A= =0A= =0A= [Videolib] Looking for technical information=0A= =0A= =0A=

=0A=

Hi = Val,

=0A=

I found a short article in = the "How It =0A= Works" series which might be helpful for your first = question:

=0A=

"DVD-Rs contain a clear layer = of an organic =0A= material that is transformed into a colored dye when activated by the = writing =0A= laser in an appropriate DVD drive. The points of dye left by pulse of = the =0A= writing laser are then read by a low-power laser in the way that the = pits of a =0A= standard DVD are read. Since the activated dye cannot be returned to its =0A= original clear state, a given DVD-R can be written only = once."

=0A=

Source: "Recording on DVDs." = How It =0A= Works: Science and Technology. Vol. 3. New York: Marshall Cavendish, =0A=

=0A=

&nbs= p; =0A= 2003.

=0A=

Hope this helps,

=0A=

Ameet

=0A=

Ameet Doshi

=0A=

Resident Librarian =

=0A=

College of DuPage = Library

=0A=

Glen Ellyn, IL

=0A=

(630) 942-2383

=0A=

doshia@cdnet.cod.edu

=0A=

=0A= From: = videolib-bounces@library.berkeley.edu on =0A= behalf of Val Gangwer
Sent: Fri 7/8/2005 11:13 = AM
To: =0A= videolib@library.berkeley.edu
Subject: [Videolib] Looking for =0A= technical information

=0A=

Hello all,
I am looking for information on the = actual burn =0A= process for DVDs. I was told
that these discs have a dye layer that = is =0A= altered to make the copy. First,
is that right? Second, do all home = burning =0A= discs work the same way?
Thanks for any light you can =0A= shed.
Val

Valerie Gangwer
Director of Audiovisual = Services
Mary =0A= Baldwin =0A= College
540-887-7084

______________________________________= _________
Videolib =0A= mailing list
Videolib@library.berkeley.edu
http://www= .lib.berkeley.edu/mailman/listinfo/videolib

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