Hi, I have an external USB2 Western Digital Hard disk, on the weekend it started top play up. I can view the files and folders on the disk, but i cannot open any of the files. i can also not write any files or folders to the disk. When i click a file to open, the hard disk light just flashes on, off, on, off (not as fats as normal) etc every half second, and it just hangs. Any suggestions as to what is wrong with it, also when i open Computer Mangement it says the disk is healthy. Cheers in advanced.