Q: Access denied on TimeMachine after formatting OSX I formatted a Mac and installed the latest OSX. This Mac was using Time Machine with an external hard drive.
Now, I am unable to access folders on that disc that were created before the formatting.
In Finder they appear with a red stop icon and trying to open these folders give me an access denied error.
Trying to chmod or chown them gives me an error as well (with sudo obviously).
Here is what ls says about one of those folders:
drwx------+ 11 502  staff  -        816 20 aoû 19:11 Dropbox
0: group:everyone deny     add_file,delete,add_subdirectory,delete_child,writeattr,writeextattr,chown

I've also tried:
sudo chflags -R nouchg Dropbox/, it did not give any errors but did not fix anything.
Also: 
sudo chmod -N Dropbox/ 
chmod: Failed to clear ACL on file Dropbox/: Invalid argument

