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  • Hell, I didn't know about this behaviour until it happened to me today. I downloaded 2GB of ebooks and my C drive free space fell to about 10GB. The Advanced properties fixes mentioned here work for me.
    – Dizzley
    Commented Jan 4, 2019 at 12:02
  • Can this auto compression be turned off permanently? I don't want this to happen by itself without my knowledge.
    – joedotnot
    Commented Aug 29, 2021 at 6:11
  • @joedotnot I think that the simple answer is "no." To elaborate, this is an inherent part of the Windows Update process and if your free disk space percentage falls below a certain threshold, the compression will occur to ensure that your operating system still receives critical security updates. As a result, it's highly unlikely that Microsoft would afford us the opportunity to turn it off. On the other hand, this situation can be avoided relatively easily by ensuring that the operating system partition maintains a healthy amount of free disk space.
    – Run5k
    Commented Aug 29, 2021 at 18:09