Hello,I have Maxtor connected such that there is a light on. However, there is a silver cord that is plugged into it but nowhere else. How do I find out how much storage space is left on this? I have another smaller storage device plugged in and working. I feel safer with the Maxtor but don't know if it's doing ANYTHING right now. Is there a place I can go online and read directions for use and then ask questions if I still need to do so? Would it hurt to have both external drives plugged in?