I was formatting an external hard drive in disk utility, waited for a while, and it said that it failed. I unplugged the hard drive, and now when I plug it in nothing shows up. The hard drive makes a sound like it's trying to work, but no go. It doesn't show on my desktop nor in disk utility. Can anyone help me get this hard drive working again? I don't need to get any files out of it, I just want to format it and have it usable.