I have a G4 with two hard drives and I needed additional storage for my photos. I purchased a WD2500JB from NewEgg that they sell in an external enclosure. It connects by USB. I was baffled about how to move all those files. I contacted NewEgg and they had to do some research with a Mac savvy person and then told me to drag and drop. When I try to drag and drop that many large files, it wants to take 40 hours or so to complete the task and freezes up before its done. Western Digital said it was designed to be an internal drive and could not tell me how to do it. My friend says to buy Retrospect (an additional $80-plus dollars). Ridiculous! I am embarrassed that I don't know the first thing about this. But I have been researching forums and the language people use is Greek to me. Can anyone help me get started with this very challenging task? I would really appreciate the help.