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When you create a filesystem, there is a parameter named as “block percent free”. This parameter should be “5%”, so a 5% of your partition size can only be written by the “root” user.
You can decrease this value or just free some space. You can try to create files or folders as root as well.
It’s illegal in Europe to have an opt-out checked by default, must be an opt-in unchecked by default. This is one of the reason that Microsoft has always troubles in Europe about privacy and opt-out services.