I can't find anything quite close to what I am looking for here. I am picturing some kind of device that has an LCD display and MP3 player style controls on it with a built in battery that would power an external hard drive and read/ play the MP3 files off of it. That I can carry in my pocket. I am thinking specifically of a device that could connect to the sata hookups on an HDD like a Seagate slim drive. I am certain that the technology exists to make this happen. The closest thing I can come up with is a SATA media player. The problem with this solution is that it requires a wall adapter and they are usually fairly bulky/ require household stereo AV hookups. If I had an electrical engineering degree I could probably build one in my basement, but alas, I do not and I can't. Please help to make this dream a reality.