Restart Mac Startup Disk

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Your Mac has the ability to boot into any form of storage connected to it, which is a huge benefit in some situations. Whether you've got a Mac hooked up over Thunderbolt and want to boot into it. Mac startup disk full? Learn how to clean up Startup Disk on your Mac, see what is taking up your disk space and how to prevent full disk error. In this article, we will show you some useful ways to clear your startup disk and free up precious space. Stick to these simple rules and you’ll improve your Mac’s performance.

  1. Restart Mac Startup Disk Without
  2. Restart Mac Choose Startup Disk
  3. How Do I Repair My Mac Startup Disk
  4. Apple Startup Disk For Mac
  5. Restart Startup Disk Mac
  6. Restart Mac Startup Disk Command
  7. Create Mac Os Startup Disk

As we all know, Apple Mac computer is a reliable and user-friendly device. But it doesn't mean that your Mac will never get into trouble and you have to reinstall the whole system. Luckily, to avoid above condition, MacOS is equipped with an emergency repair system, which applies to Mac with OS X 10.7 or later. This emergency repair system is named as OS X Recovery Mode. Once your Mac enters the recovery mode, it can easily restore OS X without any disk installed. In this tutorial, you will learn how to enter Mac recovery mode at startup, and make full use of the built-in recovery functions to reach your Mac at a perfect working condition.

Part 1. What Is Recovery Mode on Mac

Recovery Mode on Mac is a special kind of patterns. There is a special partition that saves a recovery image together with a copy of the OS X installer. From this special disk partition, Recovery Mode can load OS X's built-in recovery tools. If your Mac cannot be recovered in any other way, you can start up from Mac Recovery Mode and use its utilities to repair disk problem, restore from Time Machine, reinstall MacOS as well as getting help online on the Mac.

Part 2. Mac recovery mode options

Restart Mac Startup Disk Without

Reinstall MacOS

Download and reinstall an operating system of Mac. Depending on the key combination you used while launching the Mac, the Reinstall MacOS function will install different versions of MacOS.

Restore From a Time Machine Backup

This function aims at recovering the Mac from an external storage or Time Capsule that saves a Time Machine backup of your Mac.

Get Help Online

It supports you to browse the webpage by using Safari when your Mac is in recovery mode, including Apple's support website and get help for your Mac. But you are not allowed to use browser plug-ins and extensions.

Disk Utility

Disk Utility is designed specifically to repair disk error or erase your startup disk when the Mac cannot boot in a normal way and load the desktop.

Part 3. How to Get to Recovery Mode on Mac

How to Enter Recovery Mode on Mac – Get Help Online

Step 1. Choose Restart in the Apple menu or power on the Mac to reboot your computer in advance, which is to prepare for the next steps.

Step 2. Hold down the combination of Command and R quickly as soon as the startup music plays. Hold on until you see the Apple logo. If the login window of OS X appears, it means that you hold down the keyboards too late. So you have to restart the Mac again.

It's suggested that Mac notebook users hold down the build-in keys instead of the combination of Command and R keys to avoid the situation that startup keyboard combinations cannot register on an external keyboard.

Step 3. Choose the Get Help Online and click Continue button. Then connect your Mac with Internet via Ethernet, and now your Mac can use Safari in a recovery mode.

One thing to illustrate, the version of Safari included with OS X Recovery does not allows the plug-ins and extensions added. And you are not supported to play video over the Internet or use a private-browsing mode in Recovery Mode.

How to Enter Recovery Mode on Mac – Reinstall MacOS

Step 1. Click Restart button in the Apple menu. Hold down the Command and R combination upon hearing the Apple startup sound as the Mac restarts. Don't release these two keys until the Apple icon comes out. This step is the same as 'How to Enter Recovery Mode on Mac - Get Help Online', you can refer to it if you have any question.

Step 2. Select Disk Utility and hit Continue button. Then choose the name of the intended volume on the left and click Erase. If you want to see the extra disks, just tap Show ALL Drives tab.

Step 3. Select MacOS Extended from a pop-up window. Entitle your disks and click Erase. Then all of your data in the disk will be deleted, including your personal information. Or you can choose erasing the disk safely by clicking Security Options.


Step 4Quit the Disk Utility. Then choose Reinstall OS X and click Continue. And select the latest formatted partition on the panel. Your Apple ID might be authorized to the Mac. this is all about how to enter recovery mode on Mac and reinstall MacOS. Here you may also want to know how to delete apps on Mac.

How to Enter Recovery Mode on Mac – Restore From A Time Machine Backup

Step 1. Make sure you have turn on the Time Machine Backup beforehand. Connect the Time Machine to a Wi-Fi. Then restart your Mac by choosing power on the keyboard or clicking Restart tap on the main menu.

Step 2. Press on the Command and R keys at the same time once you hear the startup chime. When the white Apple logo appears, release the keyboard. It is similar to the Step 1 of 'Get Help Online'.

Step 3. Choose Restore button from Time Machine Backup, and hit Continue. Then you will be asked to make a choice between recovering your Mac from an external backup disk, a Time Capsule or a network backup disk. Choose one option and follow the next steps:
From an external backup disk: select the external disk and click Continue.
From a Time Capsule: Connect Time Capsule to Wi-Fi and choose Connect to Remote Disk.
From a network backup disk: choose your device and click Connect to Remote Disk.

Step 4. Choose the date of the backup and operate by following the instructions. It may take some time to restoring the whole system. Now you have restored your Mac in recovery mode successfully.

Restart Mac Choose Startup Disk

How to Enter Recovery Mode on Mac – Disk Utility

Restart Mac Startup Disk

Step 1. As always, choose the power button on the keyboard or click Restart tap on the Apple menu to restart your Mac.

Step 2. When the startup chime plays, press on the Command and R key simultaneously until the Apple icon shows up. For more detailed information about this step, check the first guide.

Step 3. Choose Disk Utility and tap the Continue button. And select the volume you want to restore in the sidebar section. Then Hit the First Aid button and then click on Repair Disk. Generally speaking, this app will inform you that this disk has been repaired.

Step 4. But it may happen that something is wrong and you need to do the following: If the error is 'overlapped extent allocation': Check each file listed firstly, confirm whether it could be replaced or re-created. If the answer is not, Open the file and check the data, then choose to delete it or not.

If the error is 'The underlying task reported failure': Launch the Disk Utility for the second time and restore the damaged disk or partition once it doesn't work, backup your data in Mac, then get the disk reformatted and reinstall the MacOS. If the disk of your Mac is broken, you may need to change a new one.

Part 4. How to Fix Recovery Mode Not Working

Restore From A Time Machine Backup

Step 1. As soon as you hear the startup chime, restart your Mac and click on the option.

Step 2. Attach the Time Machine drive. This process may take some time and please wait patiently.

Step 3. You may see the connected Time Machine drive turns come out.

Step 4. Then you can choose the recovery drive to boot your Mac.

Get Help Online

Step 1. When the startup music plays, reboot your Mac as soon as possible and tap Option > 'Command + R'.

Step 2. Hold down the combination of Command and R keys until a globe photo and progress bar appears.

Step 3. Choose a correct Wi-Fi to connect your Mac with Internet.

Step 4. Take a break and then finish the progress of starting Internet recovery.

Disk Utility

Step 1. Reboot your Mac when you hear the startup music plays, and then tap on Option.

Step 2. Connect the bootable installer drive to your Mac, and select it on a pop-up window.

How Do I Repair My Mac Startup Disk

Step 3. Then you can see the Mac reboot itself, which means that you have fixed it successfully.

Reinstall MacOS

If the others are still working, but this function is not working, please make sure that you have backed up important data already, then reinstall the macOS 11.

Part 5. How to Recover Lost Data on Mac

What if you forget to back up your precious files before reinstalling macOS? Don’t worry! Apeaksoft Data Recovery can help you get them back without any hassles. This recovery tool is able to retrieve deleted/lost data from Mac, Windows, recycle bin, hard drive, flash drive, memory card, mobile phones, etc.

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Step 1. Click the Free Download button above to download Apeaksoft Data Recovery for Mac. Then open the software after the installment.

Step 2. Choose the file type you want to recover and pick the hard disk drive you want to scan. Then start the scan by clicking on the Scan button in the lower right corner.

Step 3. In a few minutes, the default Quick Scan should be done. But if you cannot find the file you need, you should try the Deep Scan instead.

Step 4. After you find the file you want, click the Recover button to retrieve the files to your Mac.

Apple Startup Disk For Mac


It is important to read the guides of each Mac boot option, to make sure that you have understood how to enter and use Recovery Mode on Mac. However, once you can handle these options proficiently, you can make a handy guide to prevent you from forgetting the specific keys necessary for each option. We hope this passage can help you to some extent.

Create a mac startup disk

Turn on and set up FileVault

FileVault 2 is available in OS X Lion or later. When FileVault is turned on, your Mac always requires that you log in with your account password.

  1. Choose Apple menu () > System Preferences, then click Security & Privacy.
  2. Click the FileVault tab.
  3. Click , then enter an administrator name and password.
  4. Click Turn On FileVault.

If other users have accounts on your Mac, you might see a message that each user must type in their password before they will be able to unlock the disk. For each user, click the Enable User button and enter the user's password. User accounts that you add after turning on FileVault are automatically enabled.

Choose how you want to be able to unlock your disk and reset your password, in case you ever forget your password:

  • If you're using OS X Yosemite or later, you can choose to use your iCloud account to unlock your disk and reset your password.*
  • If you're using OS X Mavericks, you can choose to store a FileVault recovery key with Apple by providing the questions and answers to three security questions. Choose answers that you're sure to remember.*
  • If you don't want to use iCloud FileVault recovery, you can create a local recovery key. Keep the letters and numbers of the key somewhere safe—other than on your encrypted startup disk.

If you lose both your account password and your FileVault recovery key, you won't be able to log in to your Mac or access the data on your startup disk.

Encryption occurs in the background as you use your Mac, and only while your Mac is awake and plugged in to AC power. You can check progress in the FileVault section of Security & Privacy preferences. Any new files that you create are automatically encrypted as they are saved to your startup disk.

When FileVault setup is complete and you restart your Mac, you will use your account password to unlock your disk and allow your Mac to finish starting up. FileVault requires that you log in every time your Mac starts up, and no account is permitted to log in automatically.

Reset your password or change your FileVault recovery key

Restart Startup Disk Mac

If you forget your account password or it doesn't work, you might be able to reset your password.

If you want to change the recovery key used to encrypt your startup disk, turn off FileVault in Security & Privacy preferences. You can then turn it on again to generate a new key and disable all older keys.

Turn off FileVault

If you no longer want to encrypt your startup disk, you can turn off FileVault:

  1. Choose Apple menu > System Preferences, then click Security & Privacy.
  2. Click the FileVault tab.
  3. Click , then enter an administrator name and password.
  4. Click Turn Off FileVault.

Restart Mac Startup Disk Command

Decryption occurs in the background as you use your Mac, and only while your Mac is awake and plugged in to AC power. You can check progress in the FileVault section of Security & Privacy preferences.

Learn more

Create Mac Os Startup Disk

  • Learn how to create and deploy a FileVault recovery key for Mac computers in your company, school, or other institution.
  • If you're using FileVault in Mac OS X Snow Leopard, you can upgrade to FileVault 2 by upgrading to OS X Lion or later. After upgrading OS X, open FileVault preferences and follow the onscreen instructions to upgrade FileVault.
  • RAID partitions or non-standard Boot Camp partitions on the startup drive might prevent OS X from installing a local Recovery System. Without a Recovery System, FileVault won't encrypt your startup drive. Learn more.

* If you store your recovery key with Apple or your iCloud account, there's no guarantee that Apple will be able to give you the key if you lose or forget it. Not all languages and regions are serviced by AppleCare or iCloud, and not all AppleCare-serviced regions offer support in every language. If you set up your Mac for a language that AppleCare doesn't support, then turn on FileVault and store your key with Apple (OS X Mavericks only), your security questions and answers could be in a language that AppleCare doesn't support.