First off hi all, I just bought a 13" macbook pro and I love it. But I am new to mac and having trouble. I put all my movies and music on an external hard drive to save space on my computer. Then as I get new stuff I stick it on, no problem on my pc but on my mac not so much. I can pull files off my portable hard drive no problem but my mac will not let me put anything on. What gives? Any help would be great. Thanks.