any cd drive should be able to read the disks onless you burnt them in a certain format that needs a program to read them , if you just burnt them in standard format it doesnt matter if the disc was left open as it would only be the unused prtion of the disc that was left open, the files that you already had put on it would be in a closed session,if all else fails try a data recovery software many have been listed recently that may help you do this.