Hey,
A couple of years ago I looked into this and basically it was hard if not impossible to hook up a large (probably NTFS formatted) hard drive to an Android device for moving files or video play back.
The issues were varied including plugs and software.
Mind you 'a couple of years' is a long time in Android land so as I'm considering a return to the fold what is the situation now? I'm interested in phones, tablets and what ever else runs Android.
J