Posted by Katrina to Mac Data Recovery Tips on November 16th, 2018
- Stellar Data Recovery Technician for Mac (supports macOS Catalina 10.15) This is the.
- Apr 14, 2020.
![Disk Disk](https://cdn3.geckoandfly.com/wp-content/uploads/2015/04/repair-video-master.jpg)
Since 1998, DiskWarrior has won more awards than any other Mac disk utility. A Macworld Eddy, an Apple Design Award, a PC Mag Editors' Choice Award, a MacUser Magazine Editors' Choice Award and many more from around the world. Check out our Awards and Reviews. Developed just for Mac. Once fsck finishes repairing the disk, type ‘reboot’ in the command prompt and press Enter and again run your Mac. Repair Mac Hard Drive with Disk Utility. Fixing Mac with Disk Utility is the primary and preferred way to eliminate disk issues. Disk Utility scans the disk’s structure for errors and repairs it.
With the release of macOS High Sierra 10.13, Mojave 10.14, and the latest macOS Catalina 10.15, lots of people have upgraded their systems and converted their internal SSD or external hard drive to the new file system APFS. Since APFS is a completely new file system, it contains many bugs needed to be fixed and you may have a hard time using it. Chances that one of APFS disk gets corrupted. As a result, all data on the drive becomes inaccessible. There is no need to worry as this passage will show you solutions to rebuild/repair APFS disk without losing data.
How to rebuild APFS disk?
Recommended: Back up from APFS disk at first.
When your APFS disk gets corrupted, all data on the drive is so fragile that any operation will overwrite the original data. Therefore, the first step is always to make sure you have backed up important data. If you don't make any backup, you can recover all lost data back with the help of professional APFS data recovery software. Don't have any important data? Please skip to the solutions.
iBoysoft Data Recovery for Mac is thebest APFS data recovery utility that works well in different data loss scenarios. It is able to recover lost data from corrupted APFS disk,recover lost data from formatted APFS drive, recover lost data from unmountable APFS drive, recover lost data from unreadable APFS drive,recover deleted/lost APFS volume.
Aside from APFS data recovery, iBoysoft Data Recovery for Mac also recovers data from HFS, HFS+, FAT32, exFAT drives. It supports more than 500+ file types, including documents, pictures, audios, videos, emails, etc. and different storage devices such as hard drive, external hard drive, USB flash drive, SD card, etc. It is compatible with macOS Catalina 10.15/Mojave 10.14/High Sierra 10.13/Sierra 10.12/10.11/10.10/10.9/10.8/10.7.
Follow the steps below to recover lost data from APFS disk:
Step 1: Download and install iBoysoft Data Recovery for Mac on Mac.
Step 2: Launch iBoysoft Data Recovery for Mac.
Step 3: Select the APFS disk and click 'Next' to scan all lost files. Compress 1 0 3 – image compression garments.
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 successfully recovered.
Solution 1: Repair APFS disk with Disk Utility
Disk Utility's First Aid is a tiny tool designed to repair minor problems of a disk. It can not only repair the corrupted disk structure but also the damaged file system.
Step 1: Go to /Applications/Utilities/Disk Utility/, then click Continue.
Step 2: In the sidebar, select the APFS disk you want to repair.
Step 3: Click the First Aid button and click Run.
Solution 2: Run FSCK command in Single User Mode
FSCK is a useful tool to check the consistency of a file system. To rebuild APFS disk, you can boot your Mac into Single User Mode and run FSCK command.
Step 1: Restart your Mac and, before the Apple logo appears, hold down Command and S keys. This will boot your Mac into Single User Mode.
Step 2: Type in: /sbin/fsck -fy.
Step 3: If you see 'File system was modified', then re-type in the command again until you see 'The volume [name] appears to be OK'.
Step 4: Type in reboot to restart your Mac.
Solution 3: Use repair tools
If these system utilities can't repair the APFS disk, you can try some third-party repair software. Disk Warrior, developed by Alsoft, is the most famous one. Unfortunately, the latest version of Disk Warrior can only recognize but not repair APFS disks.
Solution 4: Erase APFS disk to rebuild APFS disk
As any file system corruption can be easily fixed by reformatting or erasing, you can rebuild APFS disk in this way. But reformatting will remove all data on the APFS disk, please back up with iBoysoft Data Recovery for Mac at first.
• How to erase APFS external hard disk on Mac? Davinci resolve studio 15 2 1 – professional color correction.
Still have questions?
Undoubtedly, there are lots of reasons that can lead to failed Mac boot. And hard disk error is one of them. So it is urgent to check out the disk errors and repair them in time while you encounter this problem. Otherwise, not only you cannot boot Mac, but also you will lose many important files or folder on Mac.
![Disk Disk](https://www.howtogeek.com/wp-content/uploads/2017/12/xmacos-utilities.png.pagespeed.gpjpjwpjwsjsrjrprwricpmd.ic_.JDdofURlnU.png)
Fortunately, two built-in utilities have been created in Mac for the problem.
Disk Repair Utility For Mac
Way 1: Repair Disk Errors with Disk Utility in Mac Recovery Mode
As we know, while your Mac cannot boot normally, several boot options can help to fix problems. And utilities available in Mac recovery boot, such as Disk Utility, reinstall macOS etc could fix the disk issues. Now let's see how Disk Utility checks and repairs disk errors.
Step 1: Get to Disk Utility on Mac startup.
Start Mac in recovery mode and you could see four options that it provides to resolve hardware or software issues. Choose the Disk Utility and click Continue to open it.
Step 2: Choose the disk you need to repair.
In the left pane, there lists the Mac startup disk and other connected drives. Just click the corrupted or damaged disk from the left pane, or any other drives you want to repair. Farming simulator 17 for mac download.
Note:
Before checking and repairing disk errors, you can see the selected disk whether it can be verified or repaired by clicking 'Info' from top menu.
Step 3: Run First Aid to check and repair disk errors.
1. Click the First Aid on the top menu and tap on Run button to launch First Aid on Mac.
2. Continue while you get a prompting message from First Aid.
3. First Aid will run and check out the possible errors on preferred disk.
4. Click Done button to finish disk repairing when First Aid process is complete.
At last, you will get three results generally after First Aid process. Click the Show details to view.
Result 1: Nothing is wrong or no errors needed to be repaired.
Then you will receive message like 'The volume (the name of disk) appears to be OK'.
Result 2: You will get 'overlapped extent allocation' errors.
It means two or more files occupy the same space on your disk. Check each of them to see if you can replace or recreate it. If not, check the file content and decide if you can delete it.
Result 3: Get 'The underlying task reported failure' errors.
It means the disk has not been fully repaired. You need to run Disk Utility again and try to repair the damaged disk. If it cannot be done, make a backup of your data and then reformat the disk, and reinstall macOS. Or if the errors cannot be repaired because of physical damage, you will need to replace the old damaged disk.
Note: Besides disk repair, you could also use Disk Utility in OS X recovery mode to wipe, or restore or partition disk.
Way 2: Repair Mac Hard Disk in Single User Mode
Besides Disk Utility in Mac recovery boot, there is also a built-in disk diagnostic and repair program called fsck or file system consistency check, which could verify the current startup disk and repair it. But in order to make full use of it via command line, you should enter Mac single user mode.
Step 1: Boot Mac in single user mode.
Turn on your Mac computer. When you hear the startup tone, press and hold on Command + S on the keyboard. Until you see a text-code black screen, release the keys. Now you have successfully access Mac in single user mode and just wait for it starting fully about few seconds.
Step 2: Check and repair current startup disk.
Generally, the last line should end in root# if Mac has booted successfully in single user mode. Now right after the root# prompt, enter the following command and press Return key.
/sbin/fsck -fy
Wait for it to check your Mac's hard drive, such as check extents overflow file, catalog file, multi-linked files, catalog hierarchy, extended attributes file, volume bitmap or information. Lastly, you will be prompted 'The volume (name of your hard drive) appears to be OK' or 'FILE SYSTEM WAS MODIFIED'. Then you will see the root# prompt again.
Step 3: Reboot Mac and exit single use mode.
Enter the command 'reboot' and press Return key again. Then your Mac will restart normally from hard drive.
Tips:
Best Disk Utility For Mac
It is worth mentioning that forgotten Mac admin password can be reset in recovery mode and single user mode. More details, please go for passage about how to reset Mac admin password if forgot.
Hard Disk Repair software, free download Mac
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