HI! I bough an internal hardrive from a friend who helped me buy an external case and walked me through some steps to make it work. I was using a pc and transferred all my pictures, music, and documents onto a hd. When i connected it to my mac all i could was copy from the Hd to my mac but not other way around. Is there any way i could change that so i could use it with my mac and my pc? Thanks in advance.