Ha! You're a smart son of a gun for asking before doing...
If you inserted ANY mini-disk into that slot-loading disk drive, not only would you not see your disk again (unless you sold a few fingers for three digits), but your Powerbook might end up having SERIOUS issues, such as the optical drive being permanently damaged and requiring a very expensive replacement. I guarentee you that s*** is not covered in AppleCare/under warranty.
If you want the content off the disk, find a computer with specifically a tray-loading drive, then burn/network the data to your Powerbook.