I have a new 160GB 2.5" external hard drive (empty) and an old 80GB 2.5" external hard drive (full). I was told that I must format the new hard drive for compatibility with Mac. How can I do this? My old hard drive can be read by my Mac, but I cannot drag or drop files, which is very annoying and defeats the whole purpose. Apparently because it has been formatted to the Windows system, or something like that (I was previously using Windows). What can I do to solve this problem? I am thinking of dragging and dropping from the old to the new, and then formatting the old drive. But first, I don't even know how to format either drive in the first place! Thanks for any help.