Beware windows 10 file compression

im just saying those mostly useless popup notifications could have at least told me i need to free space for system updates, or chose any of my other drives to cashe maybe?

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I don’t think it can cache on other drives unless specified. C: is the system drive so is always used for such (unless you’ve put in your own deployment tools to use other devices for example).

It will have told you that you were low on space? That’s the key part. Though it should be documented somewhere for power users about how low space works, it’s not super clear.