Hi people! There's a strange problem in my Mac (MBA2011). A few days ago my mac started to show a partition named EFI in finder (on the sidebar). Do you know how can I hide the EFI partition again? I don't know why this has happened. Last thing I did was managing boot flags on a usb key for booting Ubuntu, but maybe I did something messy. Don't know. Any help would be appreciated. Thanks in advance!