Does anyone know if it is possible to access the iPad's camera connection kit? I would like to read the files off the connected mass storage device. Would this be possible or is this something that only Apple can do in their apps.
Thanks
I know this is an old question, but google brought me here so I thought I'd add this link for the next person to come along.
The good news is this. USB drives do mount properly and show up in the system as /dev/disk2s1. Yay. You can even add more drives via a hub. The iPad supports both FAT and HFS+ drives.
The bad news is this. As iPhone developer Dustin Howett discovered, that mount point is sandboxed away from normal developer use. You cannot read from or write to that disk using standard iPhone SDK applications.
来源：https://stackoverflow.com/questions/3041278/ipad-camera-connection-kit