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Question

Can someone tell me how a CD-RW writes data to a disk and how its able to rewrite data?

Answer 1

Normal music CDs and CD-ROMs are made from pre-pressed discs and encased in plastic. The actual data is stored through pits, or tiny indentations, on the silver surface of the internal disc. To read the disc, the drive shines a laser onto the CD-ROM's surface, and by interpreting the way in which the laser light is reflected from the disc it can tell whether the area under the laser is indented or not.

Thanks to sophisticated laser focusing and error detection routines, this process is pretty much ideal. However, there's no way the laser can change the indentations of the silver disc, which in turn means there's no way of writing new data to the disc once its been created. Thus, the technological developments to enable CD-ROMs to be written or rewritten to have necessitated changes to the disc media as well as to the read/write mechanisms in the associated CD-R and CD-RW drives.

Answer 2

go to this link it is the only way i can explain it
but it will tell you
in short the cd has a different dye
copy and paste it in the bar

http:// electronics.howstuffworks.com/
question655.htm

takes you straight to it explains everything