How to fix "First Aid found corruption that needs to be repaired" error?

By Katrina | Posted to Mac Data Recovery on October 15th, 2018 |

Running First aid gives the following "First Aid found corruption that needs to be repaired. To repair the startup volume run First Aid from recovery" Going into recovery on startup Command -R and using First aid finds no corruption and gives a green tick - going back into First aid on the disk utility gives the same original error. Any ideas MacBook Pro Sierra OS.

Why does "First Aid found corruption that needs to be repaired" error appear?

Disk Utility's First Aid is able to verify the health of a drive and then repair the drive's data structures. You can also run First Aid on a startup drive, but you can't repair the drive in the normal way. Before performing any repairs, the selected volume must be unmounted firstly, but the Mac startup drive can't be unmounted since it is in use. So an error message pops up: "First Aid found corruption that needs to be repaireded. To repair the startup volume run first aid from recovery", which prevents you from accessing the all data on the Mac computer.

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How to fix "First Aid found corruption that needs to be repaired" error?

To fix "First Aid found corruption that needs to be repaired" error, just follow what mentioned in this error message and run First Aid from Recovery. If First Aid in Recovery Mode failed, you can also use command line, or if needed, reinstall macOS.

Important: Back up your startup volume

When the Mac's startup drive gets corrupted, any operation on the computer may overwrite the original data, including repair the drive in different ways. So please make sure that you have backed up all important files before fixing "First Aid found corruption that needs to be repaired" error.

To back up data from the corrupted startup drive, you can make use of free Mac hard drive data recovery software - iBoysoft Mac Data Recovery, which is able to recover data from recover data from unbootable Mac hard disk, recover lost data after Mojave update failed, recover data from corrupted APFS boot drive, recover data from unmountable APFS boot volume etc. It supports to recover photos, documents, videos, audios, emails and much more from APFS, HFS+, HFS, FAT32, exFAT drives on macOS 10.14/High Sierra 10.13/10.12 and OS X 10.11/10.10/10.9/10.8/10.7.

Tutorial to recover lost data from startup disk with iBoysoft Mac Data Recovery

Step 1: To avoid overwritting the lost files, please download iBoysoft Mac Data Recovery to an external drive, instead of your startup disk.

Step 2: Double click iBoysoft Mac Data Recovery installation file, then double click iBoysoft Mac Data Recovery icon to directly run it (instead of dragging it to Applications folder).

Install iBoysoft Data Recovery

Step 3: After launching iBoysoft Mac Data Recovery, select the startup disk where lost the data.

Recover lost data from startup disk

Step 4: Click "Next" to search for all lost files on the startup disk.

Step 5: Preview the listed recoverable files, choose those we want, and click "Recover" to get them back.

Solution 1: Use command line to repair the corrupted drive

Step 1: Restart your Mac and go to Recovery Mode by press-holding Command + R.

Step 2: Launch Terminal from Utilities.

Step 3: Type in diskutil verifyDisk /dev/disk0 to verify your startup drive.

Step 4: Enter diskutil repairDisk /dev/disk0 command to repair the corrupted drive.

After running the above commands, go back to Disk Utility in Recovery Mode and process to repair the corrupted startup drive.

Solution 2: Reinstall macOS

Step 1: Restart your Mac and go to Recovery Mode by press-holding Command + R.

Step 2: Select Disk Utility from the Utility Menu and click on Continue button.

Step 3: When Disk Utility loads select the volume (indented entry, usually Macintosh HD) from the Device list.

Step 4: Click on the Erase icon in Disk Utility's main window. A panel will drop down.

Step 5: Set the Format type to what you want.

Step 6: Click on the Apply button, then wait for the Done button to activate and click on it.

Step 7: Quit Disk Utility and return to the Utility Menu.

Step 8: Select Reinstall OS X and click on the Continue button.

Katrina

Katrina is a data recovery expert @iBoysoft who loves to help readers solve various data recovery problems.

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