every time i connect my usb hard drive i get this error message. NTFS-3G could not mount /dev/disk1s2 at /volumes/USB HD because the following problem occurred $LogFile indicates unclean shutdown (0, 0) failed to mount '/dev/disk1s2': Operation not supported. Mount is denied because NTFS is marked to be in use. Choose one action: Choice 1: if you have windows then disconnect the external devices by clicking on the safely remove heardware icon in windows. Choice 2: if you dont have windows then you can use the force option for your own responsibility. Why isnt my usb hard drive not working. it worked on my macbook but wont work on my macbook pro. also works on my girlfriends windows pc. help.