What can be hanging up my system.
I thought I went through the necessary steps to enable mounting of an exFAT-formatted hard drive:
# Install fuse-exfat and exfat-utils
sudo apt-get update
sudo apt-get install fuse-exfat
sudo apt-get install exfat-utils
# Restart Ubuntu
sudo reboot
I can hear the hard drive spinning before I attach the device to Ubuntu (via parallels). The moment I 'plug into Ubuntu' the hard drive whirrs down and stops spinning, the UI becomes unresponsive, and all of Ubuntu seems to hang.