How CD-RWs work

I came across a pretty interesting article tonight while browsing the web. Scientific American published a brief explanation on the differences between CD-Rs and CD-RWs. Rewritables actually use dye to store data instead of etching grooves on the disc. I didn’t know that prior to the article. Also, CD-RWs using phase change metal which can be reverted back to original state in the drive. Pretty dang cool. Check out the article for a good read.