A recorder encodes (or burns) data onto a recordable CD-R, DVD-R, DVD+R, or BD-R disc (called a blank) by selectively heating parts of an organic dye layer with a laser. This changes the reflectivity of the dye, thereby creating marks that can be read like the pits and lands on pressed discs.
Optical drive's rotational mechanism differs considerably from hard disk drive's, in that the hindmost keep a invariable angular velocity (CAV), in http://www.gracedigitalaudio.com/grace-tape-2-usb-cassettes-to-usb-p-45.html other words a monophonic number of revolutions per eentsy-weentsy (RPM). With CAV, a avant-garde throughput is generally achievable at an outer disc area, as compared to inner area.