Sorry all. I did spend an hour trying to find a similar problem to mine, to no avail. ASUS laptop,1TB hard drive - 2 partitions OS & DATA, W10. Everything is going to the OS partition. I was never (I believe) instructed as to how to send all DATA to the second partition. And never checked. Now my OS partition is 80% full, and DATA is empty. What is the best way to resolve this issue?