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This guide is about the Repair Boot Disk in Mac OS X with Disk Utility & Recovery HD. I will try my best so that you understand this guide very well. I hope you all like this guide Repair Boot Disk in Mac OS X with Disk Utility & Recovery HD.

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• Shut down your Mac, insert the installer USB stick and power on the machine while holding “option” or “alt” key until the boot menu appears. You should see something like this: Select EFI.

If you’ve tried to repair the boot volume in Mac OS X before, you’ll no doubt notice that the Repair Disk option is grayed out and can’t be used in Disk Utility.

Although this is still the case when booting in most versions of Mac OS X, you can use the Mac OS Recovery partition to repair the Mac OS X boot disk, which prevents you from using an external boot drive to repair the disk.

You could use Mac OS X to handle disk images, maybe, if you use FAT32 as Windows' disk format. I don't think DOS boots on intel Macs. At least I haven't heard of it. Does Norton really depend on booting DOS?! I almost can't believe it. Then again, Norton is rather known for not-so-good software. At least on the Mac. Mac OS X Snow Leopard is intended to be a release aimed to refine the existing feature set, expand the technological capabilities of the operating system, and improve application efficiency. Many of the changes involve how the system works in the background and are not intended to be seen by the user.

The trick is to boot your Mac into recovery mode first and perform the repair operation from there. After booting into recovery mode, you will notice that the Disk Utility repair feature has been removed, and you can repair the boot disk as intended. We will tell you exactly how to do this, step by step.

How to Repair a Mac Startup Disk with Disk Utility in Mac OS X.

1. Restart your Mac and hold down Command + R to start recovery, or press and hold OPTION
2. Select “Recovery HD” from the start menu
3. On the Mac OS X Utility screen, select “Disk Utility”
4. Select a boot volume or partition from the left menu and click the Repair tab
5. Repair Disk is now possible, correct the boot volume by clicking Repair Disk

The repair process can take a while if there are a lot of errors in the drive, but often no problems are found, so nothing is executed. It’s best to let the process go, of course, because it can take a while, and you don’t want to interrupt the initial scan of drive problems or repair attempts assuming that problems have been found on the drive.

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In recovery mode, you may also want to check and repair disk permissions, repair user permissions, and check and repair other disks.

Mac Os Boot Volume

Once again, if you find that the Repair Disk feature is grayed out and can’t be clicked in Disk Utility, be sure to restart your Mac in recovery mode to make it available again.

Remember that “Verify Disk” is always available regardless of whether it is booted from the primary boot drive or not. It’s just a Repair feature that requires the latest versions of MacOS and Mac OS X to be used from a recovery disc or other boot disk on a Mac.

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You set your Mac or Macbook which disk to start up from when more than one startup disk is connected. This works for USB drives including the NinjaStik

For 2018 to 2020 Macs with the Secure Boot T2 Chip, see the 2020 Macbook Pro Boot from USB instructions.

A “startup disk” is a volume or partition of a drive that contains a bootable operating system.

You can set your Mac to automatically use a specific startup volume, or you can temporarily override this choice at startup.

1. From the Apple menu choose System Preferences.
2. Click the Startup Disk icon in System Preferences, or choose View > Startup Disk.
3. Select your startup disk from the list of available volumes.

The next time you start up or restart your computer, your Mac starts up using the operating system on the selected volume.

Temporarily change your startup disk with Startup Manager

Startup Manager allows you to pick a volume to start from while the computer is starting up.

Use these steps to choose a startup disk with Startup Manager:

1. Turn on or restart your Mac.
2. Immediately press and hold the Option key. After a few seconds, the Startup Manager appears. If you don’t see the volume you want to use, wait a few moments for Startup Manager to finish scanning connected drives.
3. Use your mouse or trackpad, or left and right arrow keys to select the volume you want to use.
4. Double-click or press the Return key to start up your Mac from the volume you selected.

If you have an optical drive connected to your computer, you can insert an installation disc to see it in Startup Manager. You can also attach FireWire or USB external hard drives that contain an operating system to add to the list of startup volumes.

Startup Manager automatically adds bootable volumes as you connect them.

Restart in OS X from Boot Camp

If you have started up your Mac in Windows using Boot Camp, you can use the Boot Camp system tray to switch your startup disk default back to OS X.

1. In Windows, click the Boot Camp icon in the system tray.
2. From the menu that appears, choose Restart in OS X.

Start from OS X Recovery

You can also start your Mac from OS X Recovery or Internet Recovery if your Mac was manufactured after 2011.

To start your Mac from the Recovery System, use these steps:

1. Start up or restart your computer.
2. Hold down the Command and R keys on your keyboard until you see the Apple logo appear onscreen.

If you don’t see a volume listed

If you don’t see the volume you want to start your computer from, check the following:

• If you’re using an external drive, make sure it’s connected and turned on.
• Make sure you’ve installed an operating system, like OS X or Windows on the drive you’re trying to start from. Volumes that don’t contain a valid operating system aren’t listed in Startup Disk or Startup Manager.
• If you’ve installed an operating system on a drive but it isn’t listed, the volume you’re trying to start from might need repair. If the volume contains OS X, start your computer from OS X Recovery and use Disk Utility to repair the volume, or reinstall OS X on the volume using the Recovery System.
• Depending on the Mac you are using and the version of OS X that is installed, the Recovery System volume (Recovery HD) might not show up in Startup Manager. Press Command-R during startup to start your Mac from the Recovery System.

For 2018 / 2019 Macbook Pro with the Secure Boot T2 Chip, see the 2018 Macbook Pro Boot from USB instructions.

Tombstone Boo! Mac OS