I rolled back my OS to 10.11.5 and got into some permission trouble with a few drives (not all). I got them working by Getting Info on each problem drive, then manually adding myself back to the drive with read and write permissions. But... I want to **learn**... Some drives say have permissions for kirkross (Me), staff & everyone... while others had System, wheel & everyone (and NOT me)... how did I disappear from those drives? I'd just chalk it up to the OS restore, but I want to understand the mechanics.