Here is a video of a guy who go the mc exploit to work on the slim ps2 with codebreaker. Here is the youtube video link http://youtube.com/watch?v=S4AtFPNNLVA I got sick of people saying it is impossible and it took me hours but I finally found the answer! please share it with anyone who is asking.
This method really works I am able to play Burned ps2 DVD Backups, Burned ps2 CD Backups and Homebrew on my Ps2. You can too. All you need is a Slim ps2, Codebreaker, a compatible USB flash drive, tape, and a pencap. You do have to open up your ps2 but all you have to do is tape down sensors, so for the cost of codebreaker and a usb flash drive you can play backups.