i realize that there are compatability issues with the different types and formats of discs. my question: is there a setting (or anything) that can be changed to read these discs? i have a +/- r burner. i have made data discs with both types. however, when i take my -r disc to another computer, the computer does not recognize that there is a disc. i have no problems with a +r in the other computer, nor do i have problems with this -r in any other computer. i realize what i can do in the future to prevent this, but for the data discs that have already been burned, is there any "salvation" ?? thanks for your time.