[CoLoCo] Pressed (Silver) CDs

[Michael "TheZorch" Haney]

Jim Hutchinson wrote:
> I have some gold cds too (but not ubuntu - music cds). I think it
> would be cool if lts discs were gold.
The reflective surface you see on audio & software CD/DVDs and 
CD-R/DVD-R disks is aluminum and sometimes gold.  This is a reflective 
surface for the read laser to bounce off of when the disc is being 
read.  The data on a pressed CD is etched onto a piece of polycarbonate 
or sometimes glass (yes, some older CDs used glass but most are 
polycarbonate today) with a coating of clear lacquer covering the 
surface where the data is etched into the disk.  This is why those 
scratch repair kits often do work, sicne that lacquer coating is easily 
repairable.  The reflective layer is put on the label side surface of 
the disk with a clear adhesive and protected by a stick on or printed on 
ink label.

-- 
Michael "TheZorch" Haney
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