If after mounting MacOS image files or disk partitions you can not change the owner of files inside them due to you've got an error saying ingore ownership. For example: After adding a new hard drive to an Xserve, you cannot remotely change permissions to the new volume using normal means. Using "chown" results in no error, but the owner remains the same. Using "chgrp" results in no error, but the group remains "unknown." run the next command to modify this behaviour. $ sudo /usr/sbin/vsdbutil Read more...