The choice between portable and internal storage is whether Android formats the disk internally, ie in such a way as to be encrypted and handled efficiently, but unreadable by other systems such as your PC. External storage will be accessible to other systems. So, if you intend to leave the HD in the box, then you might make it internal. If you later change your mind, you won't have access to the data on it. You'll have to reformat it to use it elsewhere. (Don't trust me: check it out!)

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