Hi. I have an iPad Air MF003LL/A (black). I have music and movies on my computer I want to watch on my ipad. Will someone recommend an SD card or some external hard drive that works well with this model? (I'm not interested in cloud services). Also, how does it work? Is it simple plug and play, like can the ipad read/play the music from the drive once its plugged in? Or are there other steps I need to take? Just wondering if there are any other accessories or software I need to make sure it works. Thanks.