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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.
From the article:
If this was a response to write speeds they meant the speed at which data can be written to the disc, not the time ot takes to build the disc. Read/Write speeds are a standard measure used to tell whether something would be efficient to use. For example one could say storing an OS on a DVD and booting would be dumb because it would run extremely slow, where as the read speed for playing music or a movie off it wouldn't be an issue as it doesn't need higher performance for such.