MLA Citation: Bloomfield, Louis A. "Question 430"
How Everything Works 17 Jan 2018. 17 Jan 2018 <http://howeverythingworks.org/print1.php?QNum=430>.
430. Why can't CD's be recorded onto other CD's?
Most of the CD's you encounter are prerecorded. These CD's were mass-produced from a master, using plastic molding techniques, followed by metal deposition and painting. Recordable CD's, which are used now in CD-ROM applications, are written by an intense laser beam, which alters the reflectivity of the CD spot by spot to create a disk that behaves just like a prerecorded CD. However, once a CD has been "written", it cannot be cleaned for rewriting. At present, recordable CD's can only be written once. There are some new optical and magneto-optical techniques around that allow erasure, but I don't think these techniques have appeared in CD's yet.

Return to HowEverythingWork.org
Generated for printing on Wednesday, January 17, 2018 at 15:12:30 EST
Copyright 1997-2018 © Louis A. Bloomfield, All Rights Reserved
Privacy Policy