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CD-ROM
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A CD-ROM is a type of read-only memory consisting of a pre-pressed optical compact disc that contains data. Computers can read—but not write or erase—CD-ROMs. Wikipedia
Capacity: 553–900 MB (12 cm), 194 MB (8 cm)
Read mechanism: 600-780 nm laser diode, 150 KB/s (1×; 150 × 210), 10,800 KB/s (72×)
Released: 1985; 39 years ago
Standard: ISO/IEC 10149
Usage: Data storage
Write mechanism: Pressed mold
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