Ipad Mini Retina: Possible to use external HD?

I am thinking about buying an Ipad Mini Retina, but one things stops me - yet - from buying.
Is it possible to attach an external HD via USB On the Go to an Ipad Mini Retina?
And, is it possible to attach an external HD via USB On the Go to a ?jailbreaked/jailbroken? Ipad Mini Retina?

If the answer is yes, I am going to buy one, if no I have a lot of thinking to do :-)

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