It's been a long time since DVD became common in our everyday life. However, most people don't seem to know what it is exactly. Answers to questions like "what sort of arcane symbols are printed on disk boxes", "how come DVD is different from CD if they look so similar", "what kinds of DVDs are there" and many others still remain mystery for many users. And instead of making conscious choice they just buy randomly without any knowledge of what exactly they are getting.
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