I have a 1tb WD external hard drive, and it was working fine using it with my MacBook Pro, until a friend of mine used it to copy a movie file from that WD external hard drive, and plugged it in her Sony VAIO laptop. I copied another movie stored in a folder from her. And when I moved the folder to my "Movies" folder, it just made a copy. I tried deleting the original folder by dragging it to Thrash but it won't delete the folder. Right after I drag it into the Thrash, it says "Finder requires that you type your password". I do that, but it still doesn't delete the folder. I'm afraid this is what's gonna happen to every folder I copy. Please help me. I don't have a place to move/transfer 300GB of files, pictures, etc. Thank you so much in advance.