PhoneDisk is an app available for both Mac and Windows that transforms your iPhone into an external hard drive. Using PhoneDisk, you can preview, open, edit and save images, documents and more directly on your iPhone.

Best of all, this applications is available for free until December 1st 2010… 

Simply, get on the official site, download it, then use this key to unlock all the features for free: “2H96A-QK7MX-8GEYK1V-ZR6S8”

Connect your iPhone to your computer via USB then launch PhoneDisk and you will get access to all folders. If your device is jailbroken, you will get full access to all system files, folders, otherwise, it will only display those related to media.