I have just saved some data from a crashed PC to my external HD, which is a HFS+ Volume using Ubuntu live (regular copy no dd). Now I am lost: I don't have any privileges in the Folder i copied on my Macbook. I tried changing it using chmod and chown, both as regular user and as root, but I always get a "operation not permitted". The owner for all those files is "999".
It worked to set it to ignore Ownership.