I have read 3 books and lots of online info on boot disk. I use a boot disk to start Linux on my Windows machine. I would like to be able to update the disk as I make changes and also have a spare boot disk. The only problem is I can't find out how. I tried mk bootdisk but I can't find the right command line to execute it from. It doesn't work from the root, or the shell. Can someone tell me how to make a back up boot disk and how to update the one I have?