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Posted by Lyrik on 12/30/07 02:09
Den 28.12.2007 kl. 23:11 skrev Bells <ilovetospamu@spam.com>:
> They all scratch equally.
> Blu Ray disks have a rot problem though that is becoming common on DVD=
's
> I have 2 that have gone bad.
>
> http://www.digg.com/tech_news/Blu_ray_disc_coatings_starting_to_rot
>
> http://www.avsforum.com/avs-vb/showthread.php?t=3D857067
.................................
Well I have expected something of the sort. The data layer sticks only 0=
..1 =
mm under the surface. So they in the panic overlayered it with a hard =
coat. The sandwich consists of two different materials with two differen=
t =
expansion data.
The heat from the laser and player will make the disc enlarge and retrac=
t =
in different tempi for the two layers. Little cracks develop like little=
=
bubbles or slips between the layers. That's what I think!;)
0.1 distance to the surface is just too little.
HD-DVD has 0.6 mm to the data, the same as ordinary DVD's. Thats tested =
=
and OK.
-- =
Greetings from Jens "Lyrik" Bech.
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