Jet, you were right I was using the same layout for slax6 as for slax5 and as you know it didn't work. I tried doing it your way with the boot and slax dir under a slax6 dir and it worked with: from=/slax6 What did you mean by 'from=' changed a little bit? Here's the interesting part, BT3 works with the usual layout, boot and data dirs split, BUT using Jotnar's mkisofs command line (Jotnar, can you expand on why this works...), I'm guessing this has something to do with the file system since my initial one used rock ridge while the new one uses joliet? Funny though i expected BT3 to behave like Slax6, guess i was wrong. Thanks, midz