I have 2 PC's running on Windows XP ( SP2 on both) When I put an already used CD-R into one PC and go into my computer right click cd drive & properties I get a pie diagram showing used & free space on that disk. Fine. I can add to it. When I do the same with the other PC it shows the disk is full, even though I know it isn't & I can't add to it. Is the problem with drive , the settings or something else?