I have an external hard drive that I had been using for years with my MBP. The last time I used it I used it with another Mac running Windows. I go to plug it in and find I can't add a new folder... I'm pissed. I didn't reformat the drive or anything the last time I used it. All of my information is still there. I'm now trying to drag things to the desktop so I can clear off the drive to reformat it, but I just got an error message saying that I don't have permission to access some of those documents. Any advice? ETA: I just got a message saying that the folder can't be copied because there isn't enough space. What do you suggest I do now?