I have an imac 27 with an internal 2tb drive formatted in Mac OS extended it says, I also have windows installed on this machine via bootcamp and have a 2tb external drive formatted in ntfs that had some old windows files on it from my previous computer. I was moving all the files from my 2tb ntfs drive via usb to the internal mac's hd, and realized I wanted to put some back onto the 2tb usb ntfs drive but it doesn't seem to be letting me do this. I am new to mac (prob something very simple), it let me put the files onto the mac drive just can't get them off the mac drive back onto the usb ntfs drive. When I try to drag them over i just see a circle with a line thru it saying no no no... I want it to say yes yes yes hehe... These are large 2-6gb files mostly vob and avi movie files but even my mp3 and wav music files which are much smaller won't pull over either same circle bar restricted type thing.