MY WD 500GB USB HD just yesterday stopped working normally, it was working fine two days ago. When I connect the drive via USB it appears as a different drive letter for some reason Local Disk : I then disappears. My laptop makes two noises one that I've connected a device to the laptop then another noise which is when I disconnect a device. It makes this connection/disconnection noise when the HD is plugged in numerous times every minute or so. The HD doesn't appear in windows explorer but appears in devices. Very strange and unusual any ideas?