Thanks for the suggestions but I should have told Jimbo that it is a (mostly) dead OS X 10.4 HD. The Mac machine will not see it at all, and Windows XP will see it, but as an uninitiated disk. MacDrive sees it as a unrecoverable / damaged file structure disk ... the repair option does not work as it does not see a Mac Volume. It gives the option to reformat but that is not what I want to do. Any suggestions on industrial strength data recovery? My nephew has most of his Master's research on this puppy and isn't really in a position to send it to a recovery service for $2500 Tanks in advance