Before last week, it was working fine. I went out of town for thanksgiving, and turned the disk off and shut down the MacBook Pro. Now, when I got back and turned the disk back on, it wouldn't show on my MacBook Pro. It wouldn't show in the disk settings in the AirPort Utility. I tried to reboot the AirPort to no avail. It's not the drive, because I attached it to the MacBook Pro directly and it works fine. What's going on?