I am copying files from an internal disk to an external one attached by USB (both are formatted as Mac OS Extended (Journaled)
):
root# rsync -avi /Volumes/int_hd/ /Volumes/ext_hd/
All directories and files on the target drive /Volumes/ext_hd/
have owner and group _unknown
. Example:
root# ls -ld /Volumes/ext_hd/Users/sam/Documents/
drwx------ 16 _unknown _unknown 544 Mar 28 2014 /Volumes/ext_hd/Users/sam/Documents/