Optical disk drives hold over 50 gigabytes of data. There are three types : Compact Disc (CD), Digital Versatile Disc (DVD), and Hi-Def Disc. Compact Disc is optical format which memory from 650MB to 1GB capacity with rotation speeds vary. Digital Versatile Disc known as Digital Video Disc (DVD) which similar to CDs, but can store more data from 4.7GB to 17GB on the single disc. Hi-Def Disc is the next generation of optical disc which far greater capacity than DVDs.
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