Use iPhone into Portable Drive
Now you can easy use you Iphone as a Portable Drive but you have to use MacFUSE filesystem.
Disk for iPhone is a MacFUSE based filesystem that allows you to read and write files on your iPhone. It uses the MobileDevice API (like iTunes) to access the filesystem of the iPhone over USB.
there is so many issues but you have to read it
REQUIREMENTS: You must have MacFUSE installed. See http://code.google.com/p/macfuse/ for more details on MacFUSE.
Direct link
http://code.google.com/p/iphonedisk/
