How To Repair Untitled.disk In Imac Yosemite

If you've encountered a trouble with macOS, the solution might be to reinstall the organisation on your Mac. This can exist done by any Mac owner, just it can be a little bit complicated. You'll need to put your Mac into macOS Recovery, which gives you tools to diagnose problems on your Mac, as well every bit reinstall the operating system.

Hither'due south how to reinstall macOS using Recovery fashion.

Entering macOS Recovery
How to check your startup disk with Disk Utility in macOS Recovery mode
How to reinstall macOS while in Recovery style

Entering macOS Recovery

macOS Recovery has tools at its disposal that allow you to diagnose bug with your Mac's hard drive, reinstall macOS, and restore from a Time Machine fill-in. You can enter Recovery by pressing certain key combinations. The combination you choose will determine which version of macOS will be installed on your system when you select Reinstall macOS.

Press Command - R to install the latest version of macOS that was installed on your Mac without installing a afterward version.
Printing Options - Command - R to upgrade to the latest version of macOS that'south uniform with your Mac.
Press Shift - Option - Command - R to install the version of macOS that came with your Mac, or the version closest to it that's still available.

How to check your startup deejay with Disk Utility in macOS Recovery way

The first affair you'll desire to do is make sure your Mac's startup disk is healthy. You'll demand to utilize Disk Utility to exercise that.

Click Deejay Utility when in macOS Recovery.
Click Continue.
Click on your Mac's startup bulldoze in the Deejay Utility sidebar. It should be the drive at the top of the sidebar if there are multiple drives.
Click First Assistance.
Click Run. First Assistance will run, checking the health of your Mac's drive. This process could have a piddling while.
Click Done.
Click Deejay Utility in the Menu bar.
Click Quit Disk Utility.

How to erase your startup disk in macOS Recovery fashion

If you need to start completely fresh, and then yous'll want to erase your startup disk using Disk Utility. If you want the content on your Mac to stay intact, skip to the next section.

Click on your startup deejay in the Deejay Utility sidebar.
Click Erase.
Click the Format driblet-downwards menu.
Click on the format you want to utilize for your bulldoze. If you lot're running macOS Loftier Sierra or later on on a Mac with an SSD, your choices will be some form of APFS.
Click Erase. Your bulldoze volition proceed to be erased.

How to reinstall macOS while in Recovery style

The next step is to reinstall macOS.

Click Reinstall macOS.
Click Proceed.
Click Continue.
Click Agree.
Click Hold.
Click on the drive on which you lot wish to install macOS.
Enter your Apple ID and countersign if you're asked to, though you might not be.
Click Install.

Your Mac will now go through the normal macOS installation process, eventually restarting. If yous're starting from scratch, yous'll demand to ready your Mac from scratch.

How to set upward and customize your Mac from scratch

Questions?

If yous have any more questions most reinstalling macOS on your Mac, let us know in the comments.

Updated December 2022: Everything is up to date through macOS Catalina.

Out of the box

Give us these GameCube games on Switch!

You lot tin can now play games from the many consoles of Nintendo's past on the Nintendo Switch, but not every bit many from the GameCube. Here are some titles nosotros'd similar to run into over again on the new console.