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Quake-like game made with JavaScript takes up just 13KB of storage
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
You present a false dichotomy. Yes, things like uncompressed audio and HD video take up more storage space, but that does not negate that modern commercial software is very inefficient with how it uses resources. You could improve the efficiency of the system while keeping HD video, it is not a mutually exclusive choice.
For example, booting up Windows and doing nothing takes up 4gb of RAM, while doing the same with a lean Linux installation would take up a quarter of that, despite both operating systems having identical functionality (run web browser, open applications, edit documents, play games, etc).
Does Windows booting take up that much space because of code, or because of data that code is loading?
4GB is what Windows idles at for me, after everything has loaded.
How much of that is cached state based on the percentage of ram available?