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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.
Streaming services definitely don't give you full quality files. They're compressed to save bandwidth. Netflix only uses about 7GB per hour in 4k. That's about the exact size of the higher quality 1080p movies I download.
It's usually less than 7gb per hour, it ranges from 2 to 7GB, it adjusts butrate on the fly. Netflix quality sucks.
Edit: realized I typed butrate instead of bitrate, it fits, so I'm leaving it.