My computer (2008 e-machine w/vista) is running so slow I think it is sometimes backing up instead of going forward. It was suggested that I look to see how full my drives were. Plenty of room on all but Pioneer external DVD-RW X-122. It is showing 0 bytes left. I don't understand why an external RW should be anything but empty after I am through using it. Got any suggestions, please let me know as I am out of ideas. P.S. My computer skills are that of a very slow amature.