The error message indicates the drive you are using is formatted Windows NTSF not Mac OS Extended. To use it for either an iTunes or Photos library it must be formatted Mac OS Extended (journaled). Take a look at the drive in Disk Utility and I believe you will find the drive is NOT properly formatted.

Unless the drive is being accessed by Windows computers as well as your MacBook Pro you should be able to repartition the drive not the volume on the drive (even if it is still a single partition) and choose a GUID partition map and Mac OS Extended (journaled) as the format. That should clear up your problem.


"All you've got to do is own up to your ignorance
honestly, and you'll find people who are eager to
fill your head with information"
--Walt Disney