Optical Storage Devices

**Definition:** A computer disk read by a laser beam, containing data prerecorded by a vendor. The buyer cannot enter or modify data in any way but the advantages lie in the speed of accessibility, relative immunity to damage, and relatively low cost of purchase.

**Tree numbers:** - J01.897.280.500.668 - L01.224.230.260.115.475.600 - L01.462.500.820.090.668