What is the name of the mode in which windows writes all changes to RAM and not to disk?

Question

Windows

I used it for a long time, and now Google and Yandex are silent like partisans;
it was still possible, if desired, to save changes on exit or reset them on each reboot

Answer 1

I remembered that this came from windows embedded
ewf (Enhanced Write Filter)
uwf in newer versions

Answer 2

In windows xs, but this can be done using acronis true image and also here a lot of programs for this were discussed:
Restoring the original state of the system at each boot