iPad USB flash drive file transfer Can I use a 30 pin to USB adapter to connect a USB flash drive to an iPad and transfer arbitrary files back and forth?  

please address specifically:


Can ANY file be transferred? Not just Image or Music files?
This can be done WITHOUT any modification (jail-breaking)


Please provide references to adapter device specifications and references from reliable sources addressing the above specific points.
No, you can't do this without jailbreaking.

http://www.pocketables.com/2013/02/accessory-review-apple-lightning-to-usb-camera-adapter-for-ipad.html

No, you cannot transfer any arbitrary files.  you cannot transfer documents, txt, source, etc; you can only transfer images and videos.