When I insert a disk on which I have recorded an item, the disk's description at the bottom of the screen bears no relation to what I inserted. E.g. I put in a CD-RW, 700MB disk. The details at the bottom read: Total estimated size: 267.75 MB, remaining size 1.44MB. I cannot burn anything else on this disk. Could someone tell me what I'm doing wrong or ....., please.