Optical drives: flat circular disk, data stored as a series of bumps - way the bumps reflect laser light is used to read the data off the disk
CD - ROM (Compact Disk - Read Only Memory): distribution of software. Data is read only. Data is stored as optical pattern. Large storage capacity (600Mb)
DVD - ROM (Digital Versatile Disk - Read Only Memory): higher storage capacity than CDs, ideal for storage of multimedia files, used for distribution of movies
CD - R (CD - Recordable): allows data to be stored on DVD but only once, ideal for backing up of data or for storing digital music
CD - RW (CD - Rewriteable): allows data to be stored again and again, less transfer rate than hard disk, time taken to locate file longer
DVD - RAM (Digital Versatile Disk - Random Access Memory): allows repeated storage and erasure of data
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