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tl;dr "[...] Windows 10 leverages an efficient compression algorithm to compress system files. [...] removed the requirement for a separate recovery image."

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In addition, on an example 64-bit installation, 6.6GB are freed by the new compression algorithm and the removal of the recovery image.

As illustrated here: http://az648995.vo.msecnd.net/win/2015/03/1a.png

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