How to run First Aid from recovery mode on macOS and Mac OS X?

Posted by Admin to Mac Data Recovery on December 17th, 2019

Summary: This article will show you what is Mac recovery mode, how to start Mac in recovery mode, how to run First Aid from recovery mode on macOS Catalina/Mojave/High Sierra/Sierra and Mac OS X and how to recover data after Mac computer won't turn on.

Table of the article contents

What is Mac recovery mode?

Mac recovery mode is part of the built-in recovery system of your Mac. You can boot Mac in recovery mode and use its utilities to restore from Time Machine Backup, reinstall macOS, get help online, repair or erase a hard disk, and more.

How to start Mac in recovery mode?

Step 1: Turn on Mac computer by pressing Power button.

Step 2: Press and hold down Command+R keys immediately upon hearing the startup chime. Hold down the keys until you see the Apple logo or a spinning globe. Startup is complete when you see the macOS Utilities window:

Mac recovery mode

After starting Mac in recovery mode, select one utility and then click Continue:

Restore From Time Machine Backup: Restore your Mac from a Time Machine backup.

Reinstall macOS (or Reinstall OS X): Download and reinstall the Mac operating system.

Disk Utility: Repair or erase a disk using Disk Utility.

How to run First Aid from recovery mode?

First Aid is a utility built-in the Macintosh operating system for checking and repairing file system errors on the specific drive.

Step 1: Please boot Mac in recovery mode according to above method.

Step 2: Select Disk Utility from macOS Utilities window and click Continue.

Step 3: In the left panel of Disk Utility, select the drive you want to repair.

Step 4: Click "First Aid" button on the top of Disk Utility window.

Step 5: Click "Run" button to start the repair on the specific drive.

Run First Aid in disk utility

First Aid will check the volume for errors and then repair the unbootable Macintosh HD if necessary. Wait until the procedure is complete. If you get returned a message saying that the procedure was successful, restart your Mac computer and see if your Mac computer can be booted normally at the next startup.

If another message pops up saying that disk utility cannot repair the unbootable Macintosh HD, please recover data from unbootable Mac computer with M3 Mac Data Recovery.

How to recover data after Mac computer won't boot?

M3 Mac Data Recovery is a professional Mac data recovery software which can recover data after Mac computer won't turn on, it supports data recovery from APFS, encrypted APFS, HFS+, exFAT and FAT32 file system.

Solution 1: Run M3 Mac Data Recovery in recovery mode

If you only one unbootale Mac computer, this solution is the best choice. Step-by-step tutorial: How to run M3 Mac Data Recovery in recovery mode?

Solution 2: Create a bootable media of M3 Mac Data Recovery

This solution requires one blank external drive and another healthy Mac computer.

Step 1: Free download, install and launch M3 Mac Data Recovery software on another Mac computer.

Step 2: Click M3 Data Recovery on status bar and select "Create Boot Drive".

Step 3: Insert an external drive into Mac computer and select it to create M3 Mac Data Recovery bootable media.

Step 4: After that, please insert M3 Mac Data Recovery bootable media into unbootable Mac computer, and then press the Power button and Option key to start the unbootable Mac computer.

Step 5: After seeing M3 Mac Data Recovery window as below, please select Macintosh HD and click Next to scan data.

Mac data recovery software

If the drive is encrypted APFS drive, please click "Find Lost APFS Partitions" to scan lost data.

Step 6: After the files are found, please click "Recover" button to start data recovery.

How to erase disk in recovery mode?

Step 1: Please start Mac in recovery mode according to above method.

Step 2: Select Disk Utility from macOS Utilities window and click Continue.

Step 3: In the left panel of Disk Utility, select the drive you want to repair.

Step 4: Click "Erase" button on the top of Disk Utility window.

Step 5: Enther the name, select file system and partition partition scheme.

Step 6: If there is no important data, please click "Erase" to begin erasing. If there is important data, please recover data firstly and then erase it.