I'm using RaiDrive to mount a Google education drive and I saw the total storage of it is 7.99EB. As somebody who might not know is that TB>PB>EB. I'm not sure whether is software limitation that the limit that can been show is 7.99EB or what. But I'm sure is at least 7.99 EB. Maybe using another software will give another answer, I'm not sure.