Ok, here's the situation: suddenly, my mac is not recognizing one of my western digital mypassport hard drives. I already tested it out on both usb ports and they are not being recognized. Also i switched the cables and still doesn't work. Then I checked if it was recognized in disk utility: the drive shows up, but it doesn't recognized it's inserted.. Help anyone? It has my time machine.. backups. i need it desperately; I just reinstalled my mac.