Another interesting question... I've created some hardware to emulate an IDE hard drive. I've connected this emulated drive to a computer using a USB2.0-PATA bridge. It works well, however, due to the way things need to work it would make my life easier if I could prevent the OS from writing to my "drive". Is there a way under linux (Ubuntu 7.10) to cause a USB hard drive to be mounted read-only (it's currently being auto mounted, I don't want my changes to have any effect on other USB drives being mounted)? Is there something in the identify drive data that a hard drive returns that I can set to cause the hard drive to be read only (I can change anything there I want)? Again, I've googled, but haven't really come up with anything. Thanks for any pointers. TTYL -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist