iPad has the ability to connect external hard drive with it via Camera Connection Kit for extra storage. Maxwell C. Shay demonstrates this in a video and mount an external hard drive on iPad using the Camera Connection Kit.
NOTE: In order to connect an external hard drive, your iPad must be jailbroken. You can jailbreak iPad with Spirit. Know-How of Terminal, SSH is a plus.
You can fine detailed instructions here or simply watch the video guide below:
via [Engadget]
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