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Next-gen optical disk can store over 14,000 4k movies
(www.digitaltrends.com)
This is a most excellent place for technology news and articles.
Not to mention there's nearly 10x difference in bitrate between 4K streaming video and actual 4K HDR off a bluray. The only people who know how big a 4K video is these days are nerds and pirates, because it's not like Netflix tells you.