When CD was first developed, its protocols were codified in the Philips "Red Book," the book of specifications sent to CD licensees. CD-R and another technique, MO-R, were codified in the "Orange Book," which ensured compatibility with the Red Book standard. Therefore, CD-R and CD-RW discs have similar structures; the difference is in the details.
CD-R discs have a recording layer based on deformable dye with a reflectivity of 40–70%, while CD-RW discs have a phase-change recording layer boasting a reflectivity of 15–25%. Both types have an additional…