About Compact Disk (CD)

Aria abbasi

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Jul 27, 2014
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Hello all,

I have some questions about Compact Disk (CD).

1- What is the difference between the material of CD-R and CD-WR?
2-What the polycarbonate level of CD for?

Thanks in advance.
 
Solution
1) Do you mean CD-RW? If so, CD-RW discs can be erased and reused, though not indefinitely. They use a metallic alloy instead of a dye.

2) I'm guesssing mainly rigidity - it's the thickest part of the disc.