Re: CD & DVD Fragility...???

On Nov 21, 1:33 pm, tacit <tac...@xxxxxxx> wrote:
In article
<a0dac138-029d-4872-ad3b-2ac63c4ae...@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
The Translucent Amoebae <transamoe...@xxxxxxxxxx> wrote:

Also: Getting back to original question, it's been my understanding
that commercially made DVD's and CD's are Actually BURNED into a
plastic or metallic layer inside the plastic outer shell, such that
there are actually little tiny, itty bitty holes that are essentially
permanent...

That's a common misperception, but it's not quite true.

Commercial CDs and DVDs do have physical holes in the reflective layer,
that is true. But the holes are not burned by a laser. They are pressed,
from a "glass master" (a master of the disc that is, as the name
suggests, made of glass). The glass master is used to physically impress
a mold. The mold then stamps blank discs, and the stamped blanks are
coated with a thin layer of aluminum. The holes are the result of the
stamping process. A laser is not used to make the final discs.

http://www.groovehouse.com/assets/pdfs/How_CDs_are_Made11.pdf

--
Photography, kink, polyamory, shareware, and more: all athttp://www.xeromag.com/franklin.html

Thanx...!

Well-- It looks like this thread is done, So i'd like to extend my
special thank yous to all the nut cases in this group that restrained
themselves by posting to it...
i really appreciate it...!
.

Relevant Pages

  • Re: CD & DVD Fragility...???
    ... Commercial CDs and DVDs do have physical holes in the reflective layer, ... A laser is not used to make the final discs. ...
    (comp.sys.mac.system)
  • Re: How to make an ARM evaluation Board?
    ... >Hi Markus, ... I can understand you can do hole plating, ... layer first, but don't drill at this time. ... It requires to use laminate for expose and etching so as the holes are ...
    (comp.arch.embedded)
  • Re: New PowerMacs
    ... > and 17 inch PBs have denser displays, and get dual layer DVD Burners ... supports writing to double-layer discs. ... DVD discs hold up to 4.7GB of data, ... "If you raise the ceiling 4 feet, move the fireplace from that wall ...
    (comp.sys.mac.advocacy)
  • Re: homemade multilayer PCB?
    ... Stack of single layer boards. ... The hole in layer 1 is big enough to allow solder to join layers. ... You're assuming the holes are already plated. ...
    (sci.electronics.design)
  • Re: (OT) Warner Bros Moves Exclusivily To Blu-Ray Format
    ... Blu-ray is the technically superior format, ... While this allows Blu-Ray to pack 25 gigabytes on each layer rather than 15 ... Which is probably why the discs have an extra protective coating. ...
    (comp.sys.mac.advocacy)