It is often suggested, for air-gapped PC's, to use CD/DVD's as a transfer medium between machines instead of USB sticks or portable hard-drives as it is difficult to write data to a CD/DVD without the user noticing.
I am wondering if there are any known attacks against this type of scenario? I'm not sure its possible but i'd be interested to see if there's been any research into such attacks. Schneier's article (linked above) seems to suggest it is possible by saying:
If you've only written one file, but it looks like three-quarters of the CD was burned, you have a problem.
Is it possible to write data (even a small amount) to a CD/DVD that wouldn't, under normal circumstances be read/recognized by the operating system but could potentially be accessed by malware?