So I restarted my computer, and my external Hard drive doesn't mount. I restart again, doesnt mount. I try a different cable, different port, usb and firewire, different computer....still doesnt mount. i try opening disk utility and it doesnt load. then i unplug it, open disk util, and it loads. I plug it back in, and it shows up in the left side of disk utility, but when i click it, i cant repair the permissions, and it says under total capacity "0 bytes" is all my data completely gone?