I have switch to a Mac book Pro from a pc and have my catalog on an external hard drive. I cannot get my Lightroom CC to read the pictures from my external hard drive? When I go to import the pictures it says Lightroom catalogs can not be opened on network volumes, removable storage, or read only volumes. I am starting to hate my MAC!
I have never used a Mac, but I do know that the external hard drive cannot be formatted NTFS. If you formatted it on the Windows computer you may have formatted it incorrectly. Someone else may have more complete information.