How to solve 'Fixing damaged/corrupted partition map' error in Disk Utility?

Posted by Katrina to Mac Data Recovery on June 19th, 2018

This morning I plugged in the drive and got this message: "The disk you inserted was not readable by this computer." I tried Disk Utility First Aid and got this message: "Fixing damaged/corrupted partition map. The operation couldn't be completed. Operation failed..." I have backed up about two-thirds of the data on the drive but the remaining third has some irreplaceable data.

In Apple support communities, many people complained that they got the error message: "Fixing damaged/corrupted partition map" when they tried to verify and repair an unreadable/unmountable drive in Disk Utility. So in this post, we will talk about when Fixing damaged/corrupted partition map failed in Disk Utility.

Fixing damaged/corrupted partition map error in Disk Utility

How to solve 'Fixing damaged/corrupted partition map' error?

Since Disk Utility can't repair the damaged partition map, we can only format the drive to replace the damaged partition map. But to avoid important data loss, we should perform data recovery at first.

1. Recover data after partition map damage

iBoysoft Mac Data Recovery is able to recover lost data after partition map damage. It's capable of deleted data recovery, formatted data recovery, unreadable, unmountable and inaccessible drive data recovery, deleted/lost partition data recovery, etc. It is compatible with macOS 10.15/10.14/10.13/10.12 and OS X 10.11/10.10/10.9/10.8/10.7.

Tutorial to recover data after partition map damage with iBoysoft Mac Data Recovery

Step 1: Download and install iBoysoft Mac Data Recovery on Mac.

Step 2: Launch iBoysoft Mac Data Recovery.

Recover data after partition map damage with iBoysoft Mac Data Recovery

Step 3: Select the drive whose partition map is damaged and click "Next".

Step 4: After previewing the scanning results, choose the needed files and click "Recover" to get them back.

Step 5: Have a check to ensure we have got all lost data back.

2. Solve 'Fixing damaged/corrupted partition map' error by reformatting

Step 1: Launch Disk Utility from Utilities.

Step 2: Click the icon of the drive whose partition map is damaged on the left part of the window.

Step 3: Click on the Erase button at the top of the Disk Utility.

Step 4: Fill in the related information (name, format, scheme), then click Erase.

What is partition map?

Partition map is the unique layout of a storage device, which contains the vital information each volume, including about the reason for generating each partition, the source files that were used to create the partition, the function and global data included in the partition, etc.

Why does partition map get damaged?

The most frequent reason of damaged partition map is bad sectors, especially the boot sector. If the boot sector gets corrupted as a consequence of improper system shutdown, sudden power surge etc., the storage device will not be mounted with read and write mode resulting in data loss.

Still have questions?