ZEVO ZFS and Aperture
You can't run an Aperture Library from a device that's not formatted Mac OS Extended (Journaled).

http://support.apple.com/kb/HT3509

What can work is running a Referenced Library with the Library on an appropriately formatted disk and the Masters stored elsewhere.

Another workaround: Make a Disk Image formatted Mac OS Extended (Journaled) and store that on your device.