Hi Guys, New here & new to mac, have been a windows user forever. So just experimenting with my MBP, did the following: 1) Erased Disk through Recovery Tool at the startup screen (Command + R) 2) Reinstalled the OS from a bootable USB My Expectations (coming from windows) would be that this is a 'clean' install. However, my keychain seems to be intact! What am I missing here? Hos is that possible when I fired the entire drive, or does erase have some ambiguous meaning?