Image/Video are hard space consumers
Pure image: 640x480 pixels x 24 bits = 737 Kbytes
Video TV: 30 images / second
Total: 210 Mbps
Movie: 30 mn = 38 Gbytes, 2 hours = 151 Gbytes
But a lot of redundancy in there
Video can be compressed from 1:20 to 1:50
90% of the information can be lost, and still recover something useful
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