The iPhone photo cache is used to store the variety of image files taken from your phone's camera. This cache is stored to your device and can be accessed from iTunes on your computer. This cache will store all of the information for the images taken, and will allow you to edit and organise your photos. Viewing your cache can be done in just minutes from the iTunes main menu.
Click "Go" on the main iTunes menu and select "Home."
Select "Pictures" and click "iPhoto Library."
Click "Show Package Contents" after right-clicking on the "iPhoto Library" tab.
Click "iPod Photo Cache" to view the folder.