Definitions for "Optical disc"
Keywords:  magneto, laser, diode, pits, beam
Direct access storage format which is written and read by laser light
Any of the family of discs that relies on light[md]usually a laser beam[md]to read the data recorded on the disc.
a disk coated with plastic that can store digital data astiny pits etched in the surface; is read with a laser that scans the surface