I have a portable usb hard drive. Recently i copied a movie onto the hd. The problem is that while watching the movie from the hd, at a certain point it just stops, the indicator stops blinking, and no data is visible until usb is reinserted. However, I can “jump” over this point and watch the film till the end fine. While copying, however, the drive just stops working at the same point until usb is replugged. how can i copy the movie?