The Silence Map

Asked on Super User by ZioByte, 5 years ago. No reply there for at least a week.

What is Windows Update really doing on my disk?

Can someone shed light on what Windows Update really does (beside updating windows, of course)? After all updates are downloaded (forget about slow connection and similar crap) WU starts trashing on disk for HOURS (sometime DAYS). It is time enough to rewrite each single bit, even the unused ones, several times over. Now I am trying to install latest release (20H2) since ~30 hours and it is still trashing, preparing, restarting, ... Is this considered normal ? If so I'm really curious to understand what's REALLY doing (beside stress-testing my disk). Update: Specs of my PC are (I am sorry all

This question is one of 2 reports of the same problem:

Finding a disk drive missing after a routine Windows 10 update

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Question by ZioByte on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.