1) is there a system that can handle unix, windows and mac filenames

Yes. Use Rock Ridge extensions. That will allow for long UNIX names. If you couple it with ISO9660 youget both worlds. Caveats: Macs don't accept RR. Hell! Solution: Use level 2 (32+32) names. Problem: that's OK for VMS and perhaps Macs, but not for PC's. Solution: Use level 1 (8+3) ISO. That's easily done with the tools for Liux/Unix. I used them when I created my personal Crypto-CD a year ago. You tell the program to use Rock Ridge and convert all names to 8+3. That gives you a double directory hierarchy, one that's compatible with everything (8+3) plus one that allows long names (RR). If only Macs supported RR... ObCrypto: Have you considered the possibility of filling the unused portion of the disk with random noise from a good source? Some people could find it useful even if it is only for trial/test purposes. And, is there any possibility of making an international version of it? jr