You should just image the disc, assuming you only have one shot at reading the data, and mess with interpreting it as a second step. Running an emulator with the necessary app, and screen scraping may be necessary to recover content in some cases. -- I should also mention that part of my charter is to build a library of media and file formats (I need it to interpret the stuff in the CHM archives) and to start putting together emulator suites for data recovery and for use in Museum online and physical exhibits.