I'm trying to format an external hard drive. When I try to use Disk Utility to format and partition the drive it just hangs. There is no activity on the external disk. I've tried formatting it on a Windows machine with NTFS first, which didn't help. When I plug the drive in via USB my MBP recognizes it. After formatting as FAT32 on a Windows machine my MBP can mount it. Disk Utility just hangs when trying to partition or erase it. I've tried using a different hard drive with no luck. Any ideas?