How to fix invalid node structure error on external hard drive?

Posted by Katrina to Mac Data Recovery Tips on January 23rd, 2018

Guys! I need help! Today, my 2 TB external hard drive stopped working. When running Disk Utility's First Aid, I got the message that the external hard drive had an invalid node structure. This external hard drive was used to backup important working files. Is there any way to fix invalid node structure error on external hard drive without losing data?

Usually, when there is something wrong with internal hard drives or external drives on Mac, we will ask Disk Utility for help. But Disk Utility is only good at resolving minor errors. It is sad to admit that some complicated logical problems cannot be repaired by Disk Utility, such as invalid node structure error on external hard drive.

The invalid node structure error refers to a very serious corruption of disk directory structure. It happens not only on external hard drive, but also on internal hard drive, SD card, USB card, memory card and other storage devices on Mac. When invalid node structure error occurs on external hard drive, the external hard drive can be mounted but it is unbootable. Thus, we can't access the external hard drive.

Easy way to fix invalid node structure external hard drive

Although invalid node structure error is so tough to solve, we still can get rid of this problem by reformatting the invalid node structure external hard drive. However, it will cause important data loss if we don't have any backup before. Here is an easy method to fix invalid node structure error without losing data:

Step 1: recover lost data from external hard drive with free Mac data recovery software

To avoid important file loss, we should recover lost data from external hard drive firstly, and then fix invalid node structure error on external hard drive by reformatting. Here we recommend you a free Mac data recovery software.

iBoysoft Data Recovery for Mac is a free Mac data recovery software that can recover lost data from invalid node structure external hard drive, recover lost data from corrupted external hard drive, recover lost data from inaccessible external hard drive, recover lost data from unreadable external hard drive, recover lost data from unmountable external hard drive, recover lost data from unrecognized external hard drive, recover deleted files even empty from Mac Trash, etc. on macOS Catalina 10.15/Mojave 10.14/High Sierra 10.13/10.12 and OS X 10.11/10.10/10.9/10.8/10.7.

Meanwhile, iBoysoft Data Recovery for Mac is also the best APFS drive data recovery software that can recover lost data from APFS volume, recover lost data from encrypted APFS drive, recover lost data from inaccessible APFS drive, recover lost data from formatted APFS drive, recover lost data from unmountable APFS drive, recover lost data from unreadable APFS drive, recover lost data from corrupted APFS drive, recover deleted/lost APFS partition.

Tutorial to recover lost data from external hard drive with iBoysoft Data Recovery for Mac

1. Free download and install iBoysoft Data Recovery for Mac from iBoysoft official site.

2. Connect the external hard drive to Mac and then launch iBoysoft Data Recovery for Mac.

Recover lost data from external hard drive which has invalid node structure

3. Select the external hard drive where we have lost files and click "Next" to search for all lost files on the drive.

4. Preview the listed files, choose those we want, and click "Recover" to get them back.

Step 2: Fix/repair invalid node structure error by reformatting

After data recovery completed, we can reformat the corrupted external hard drive to fix/repair invalid node structure error.

1. Launch Disk Utility.

2. Select the external hard drive on the left part of the window.

3. Click Erase on the top of the window.

4. Complete related information (name, format, scheme), then click Erase.

Still have questions?