Basically put you cannot interface with a users CD burner from a website. It would be great fun to freak people out though.
The only solution I can see is to pass an ISO (or equivalent) image as a download. Then if the user has something that knows what to open a disk image in. It should fire up and take over, if the user selects open instead of download. Disk images can be very large though regardless of how much information you want to burn.
To me there are to many 'if's to make it a viable option. You have to hope the user has a cd burner, has software that understand a disk image, the user opens instead of saving. I would advise removing the button.