So yesterday I showed you how to take a Mac and restore it to a clean new state just like
you bought it from the store using internet recovery mode.
That restores it to the operating system that you had when you originally bought the machine.
However you may not want to do that.
You may actually want to restart a Mac, set it new, but keep the current operating system
maybe just to start off fresh or hand it off to somebody else in your family.
It's a lot easier to do that.
The way to do that, of course, is to restart it into recovery mode, not internet recovery
mode which is Option Command R but regular recovery mode which is just Command R.
So I'm going to do a restart here and as soon as I start the restart I'm going to hold down
Command and R. Then it's going to start up in recovery mode.
Now I can release and I should see it move much quicker.
It took about twenty minutes to do internet recovery mode because it had to load the entire
recovery partition from the internet but recovery mode is actually loading a special version
of the operating system that's on a hidden part of your hard drive.
So it doesn't actually have to contact the internet to do this.
It loads in pretty quickly.
So now you're in Utilities and if you watched yesterday's video you can see this looks a
little different and it says MacOS Utilities because this is the Sierra version of that.
It's using the latest version that I have on this machine rather than the original operating
system version which is what happens if you do internet recovery.
If I wanted to clear off this Mac I could go into disk utility here.
Once I'm in disk utility I can select the drive.
You can see here's, under disk images, here is the recovery partition I'm currently using.
It's very small.
It's only about 2G big.
Here is the Macintosh hard drive.
You can see that's the full drive there.
I can use Erase and I want to erase and probably keep the name, Mackintosh hard drive, I want
to do MacOS Extended and Journaled, and hit Erase.
So now you can see it's done.
Hit Done.
Now I've got an empty drive.
You can see nothing is used.
I Quit disk utility here.
Now I need to reinstall MacOS because there's nothing on that drive.
So there's nothing you can do.
You can't boot normally.
You have to only to be able to boot into this recovery partition.
If I wanted to, if I had a time machine backup and I was using this to restore my machine
I could do it from a time machine backup.
I'm going to do Reinstall MacOS.
Hit Continue.
Then it's going to walk me through the process.
I'm going to select the drive.
Hit Install.
It will download and install a fresh copy of Sierra on this Mac.
So once it's all done you end up with the Welcome screen here.
You can start setting up.
If your plan is to give this Mac to somebody else you may want them to set it up instead
of you doing it for them.
You can do that by simply using Command Q to quit and you get the option to shut down
and then basically when they start it up they end up right back on this screen where they
can set up the Mac to use for themselves with their own user account and everything.