Thanks for the reply. I did contact the iFlash guys and they recommended me 128gb so I do assume it should work fine... right? Well, I will find out one way or another. There were images of the 4th gen iPods with over 500gb in them, it looked like it was the photo one with a color screen. They just were not using Rockbox OS but I will report back on how it goes if no one else for sure knows.