A Compact Disc (CD) is an optical storage device capable of holding up to 650 MB of digital data. It uses a 4.75-inch reflective disk, and utilizes laser technology for data reading. CDs come in various forms such as CD-ROM, CD-R, and CD-RW.
Write Once, Read Many (WORM) is a storage technology that allows data to be written to a device a single time, but read multiple times. Commonly applied in data archiving and compliance.
