[opendtv] Re: The CD turns 25

> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx 
> [mailto:opendtv-bounce@xxxxxxxxxxxxx] On Behalf Of John Shutt
> Sent: Wednesday, August 22, 2007 8:25 AM
> 
> I have a few that are pushing 20 years old.  I know that CD 
> Rot was an early phenomenon, but I've never had a CD "rot," 
> or more correctly have the aluminum layer oxidize because the 
> thin top layer allowed air to enter.  I also believe this was 
> a problem with many Laserdiscs which are constructed 
> similarly, if on a larger scale and with an FM analog signal 
> instead of digital pits and lands.
> 

Laserdiscs were double sided and molded as two separate halves. They
were glued together with the aluminium coating on the inside faces. I
don't think there was a protective coating over the aluminium; they
relied on the seal between the two halves to keep air out. Which it did,
until it delaminated.

Gary

Gary Hughes
Video Architect, Advanced Engineering
Motorola On Demand Solutions, MA34
80 Central St.
Boxborough, MA  01719
Email: ghughes@xxxxxxxxxxxx
Office: 978 266 7269
Mobile: 978 339 3615

 

 
 
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:

- Using the UNSUBSCRIBE command in your user configuration settings at 
FreeLists.org 

- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word 
unsubscribe in the subject line.

Other related posts: