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Why does installing the system hard disk win 1 1 take up 75G?
If you upgrade from an old version, you will have an old version of the cache file.

It is also possible that the C disk is not formatted and the original system disk has not been deleted. If the SSD is formatted, and the occupancy rate is still high, it is possible that the SSD is damaged. You can install a 360 guard, which has a system disk to slim down, use it to test and delete some redundant files.