The advantage of using optical discs for storage is that there is random access to files and therefore no need to fast-forward or rewind in order to locate files. Optical discs are portable and suffer no wear and tear with repeated use because there is no physical contact with the reading or writing device. The major disadvantages are the low transfer speed, meaning it will take a long time to copy or extract files from the discs, and the low storage density, resulting in many discs being required to store a digital video collection of any significant size.
Extra Speed Grass Valley Edius 607
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