I guess I don't understand memory like I thought I did. I bought this computer several years ago and purchased 1.5T of memory to contain all the photos and documents we were saving. Then a few days ago I got a notice that I was out of memory and had the option of buing more. Someone please explain what the 1.5T I originally purchased is used for? I checked and my remaining amount is 1T. Why can't any excess data be stored there? What is the best solution?