Hi, allthough I haven't got hddriver I believe that bigdos is not needed. What you should do is either put hddriver.prg in your auto folder or put hddriver.sys (or whatever the name you'll figer it out :)) in the root directory of the hard drive. Basicly hddriver.sys is the same as hddriver.prg so just change the name. In my old 20meg hard disk I found that it was better to have the driver in the auto folder (executable file). But I don't know what's the case now. Experiment. Enjoy your falcon!