Before my Macbook Pro and had a HP. I have all my files from my HP on a portable harddrive that I have been using like a flash drive just dragging and dropping the files I want on it instead of it automatically updating everything. My question is if I plug it into my mac will it be fine? Will I be able to transfer the files over to my mac. I just want to make sure it wont clear my portable hard drive and I loose everything.