DVD-RW shows the amount of free space on a already burned cd-r

dvd-rw shows that a already burned cd-r has some free space on it. This particular cd-r was burned on my old computer. It was either burned with nero 6.0 ultra edition or adaptec easy cd creator 4.0. I dont remember exactly. Is it possible that a cd-r that was closed still show that theres free space and will it screw up my disk if i accidently write to it.

Sorry i dont know if this is really a cuase for concern. Just wanted to be safe than sorry.

http://club.cdfreaks.com/showthread.php?t=209046. *(link to my last post about problem with my dell computer. I wanted to know if this was related in some way)


(i provided an image of what i’m referring to)