Are you like me where you have piles of burned CD's mixed with un-written disks and then the only way to tell is to put them into your computer one-by-one to see if they have been written to. Well there is a really simple and easy way to check if the disks have been written or have not been written already.
You will need to take one of your disks and then look at the bottom (The shiny side). What you will need to look for is if the disk has a dark ring coming from the center of the disk. If the disk does then that one has been burned already. If the disk does not have a dark ring it is either full of data or is empty. To tell if the disk is either full or empty you can compare it with another blank disk and if the surface is darker it is full, if not, then it is empty.