I recommend you download and install Stellar Volume Repair application which is a Mac disk repair software. This software will help you create a bootable media with which you can boot up the Mac and repair Macintosh HDD (startup drive). Additionally, it enable Journaling on Mac volumes.
Disk Utility can find and repair errors related to the formatting and directory structure of a Mac disk. Errors can lead to unexpected behavior when using your Mac, and significant errors might even prevent your Mac from starting up completely.
Before proceeding, make sure that you have a current backup of your Mac, in case you need to recover damaged files or Disk Utility finds errors that it can't repair.
The purpose of disk repair is to recover lost data from Mac disk and and make the drive usable again. Actually, free Mac disk recovery software can't be sure of your data on the inaccessible drive. To avoid data loss, the best way is to recover lost data from inaccessible Mac disk with free Mac data recovery software and then reformat the drive.
Disk repair mac free download - Mac Free Disk Partition Recovery, Disk Drill, Disk Inventory X, and many more programs.
Open Disk Utility
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In general, you can just open Disk Utility from the Utilities folder of your Applications folder. However, if your Mac doesn't start up all the way, or you want to repair the disk your Mac starts up from, open Disk Utility from macOS Recovery:
Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:
Apple silicon: Turn on your Mac and continue to press and hold the power button until you see the startup options window. Click the gear icon labeled Options, then click Continue.
Intel processor: Turn on your Mac, then immediately press and hold these two keys until you see an Apple logo or other image: Command (⌘) and R.
You may be asked to select a user you know the password for. Select the user, then click Next and enter their administrator password.
From the utilities window in macOS Recovery, select Disk Utility and click Continue.
Select your disk in Disk Utility
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Choose View > Show All Devices (if available) from the menu bar or toolbar in Disk Utility.
The sidebar in Disk Utility should now show each available disk or other storage device, beginning with your startup disk. And beneath each disk you should see any containers and volumes on that disk. Don't see your disk?
In this example, the startup disk (APPLE HDD) has one container and two volumes (Macintosh HD, Macintosh HD - Data). Your disk might not have a container, and it might have a different number of volumes.
Repair volumes, then containers, then disks
Emergency Repair Disk
For each disk that you're repairing, start by selecting the last volume on that disk, then click the First Aid button or tab.
In this example, the last volume on the disk is Macintosh HD - Data.
Click Run to begin checking the selected volume for errors.
If there is no Run button, click the Repair Disk button instead.
If the button is dimmed and you can't click it, skip this step for the disk, container, or volume you selected.
If you're asked for a password to unlock the disk, enter your administrator password.
After Disk Utility is done checking the volume, select the next item above it in the sidebar, then run First Aid again. Keep moving up the list, running First Aid for each volume on the disk, then each container on the disk, then finally the disk itself.
In this example, the repair order is Macintosh HD - Data, then Macintosh HD, then Container disk3, then APPLE HDD.
If Disk Utility found errors that it can't repair
If Disk Utility found errors that it could not repair, use Disk Utility to erase (format) your disk.
If your disk doesn't appear in Disk Utility
If Disk Utility can't see your disk, it also can't see any containers or volumes on that disk. In that case, follow these steps:
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Shut down your Mac, then unplug all nonessential devices from your Mac.
If you're repairing an external drive, make sure that it's connected directly to your Mac using a cable that you know is good. Then turn the drive off and back on.
If your disk still doesn't appear in Disk Utility, your Mac might need service. If you need help, please contact Apple Support.
Posted by Katrina to Mac Data Recovery Tips on August 20th, 2018
When your Mac internal disk or external disk suffers from data corruption and damage, the first thing is to diagnose and repair it with Disk Utility. But Disk Utility can only get rid of some basic issues, such as hard disk structure damage, file system permission problem, etc. If your disk has bad sector, corrupted volume header or other serious problems,Disk Utility can't repair this disk and you will reminded to back up as many of your files as possible.
Since Disk utility is not sufficient to meet your advanced troubleshooting needs, you need more professional Mac disk repair software. Let's have a look at the list of several free Mac disk repair tools.
Free Mac disk repair software
There are a few free Mac disk repair software in the market. We can only find out three ones:
TestDisk
Mac OnlyX
AppleJack
Free Mac hard drive repair software can check and verify your Mac disk error. However, most of free Mac hard drive software is hard to use. Take TestDisk and AppleJack for example, both of them need to input code to run the software. But unfortunately, common people know a little about command line. Moreover, you can't make sure that your data will be intact after using repair software.
Best free data recovery software - iBoysoft Data Recovery for Mac
The purpose of disk repair is to recover lost data from Mac disk and and make the drive usable again. Actually, free Mac disk recovery software can't be sure of your data on the inaccessible drive. To avoid data loss, the best way is to recover lost data from inaccessible Mac disk with free Mac data recovery software and then reformat the drive.
iBoysoft Data Recovery for Mac is the best free Mac disk recovery software that can recover lost data from formatted, unmountable, inaccessible or even corrupted hard drive, external hard drive, USB flash drive, SD card. It recovers deleted or lost partition,recover deleted files even emptied from Mac Trash, etc.
Tutorial to recover lost data from Mac disk with best Mac disk data recovery software
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Step 1: Download and install iBoysoft Data Recovery for Mac on Mac.
Step 2: Launch iBoysoft Data Recovery for Mac.
Step 3: Select the hard drive where we want to recover lost data from and click 'Next' to scan all lost files.
Step 4: Preview the scanning results, choose files we need, and click 'Recover' to get them back.
Step 5: Have a check to ensure all lost files have been recovered.
Verdict
Data is always the most critical thing for people. So the safest and the most effective way is to perform data recovery at first and then reformat the Mac disk, whatever the disk has corrupted directory structure, damaged volume header, etc.
Disk Repair Mac Os X
• How to reformat external hard drive on Mac?
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iBoysoft Data Recovery for Mac can help you recover lost data from formatted, unmountable, inaccessible, unreadable or corrupted Mac disk. Just free download iBoysoft Data Recovery for Mac now!