I've had a bad run of luck with external hard drives. They tend to stop working at only the most inconvenient times. I've just moved and although it was packed securely, it was likely jarred around a bit and was exposed to higher than normal temperatures (outside on a hot day in an enclosed box). After plugging it back in and turning it on, it's now emitting a high pitched screetching sound. It's not loud, but past experience tells me that it's on its way out. Does anyone know what might be causing this or what I can do about it (short of procuring a replacement)?