One Byte = 8 bits = 28, or 256 options or quanta levels. CDs can store 670 MB of information and DVDs (single sided) store 4.7GB. DVDs store 4700MB/670MB = seven times more capacity. For example, 50 CDs of music can be stored on seven DVDs. Compression tools can compress disk space from about three to 200 times, depending on the stored information (i.e. text, music, video, etc). Music compresses from 1.2x to 3:1 times (MP3 format for 10:1 times), and text compresses only about three times. But, video can compress enormously, depending upon if is (1) stills, like a picture gallery or a power point presentation, or (2) movies which compress the best (roughly 100 times). The amount of compression of video depends upon the acceptability level (quality control) of lossy compression techniques.
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