How to fix/repair 'invalid volume header unsupported format' error?

Posted by Juno to Mac Data Recovery on January 31st, 2018

My external hard drive stopped been recognized. It was working fine until I did a clean install of macOS High Sierra. Now I can't access it. It appears in Disk Utility but it is called disk2s2 instead of what I named it AC Drive. It is greyed out and any attempt to repair or verify returns this message 'Invalid Volume Header: unsupported format'. Any suggestion?

'Invalid volume header unsupported format' error occurs when the directory structure of our storage disk has been corrupted. This can be caused by Mac header file corruption, sharing of file on unsupported platforms, bad sectors, unintentionally closing programs, virus infection, etc.

When getting into 'invalid volume header unsupported format' error, the failed drive can no longer be mounted or accessed. Under that condition, we can reformat the failed drive and then find our backup files. But if we haven't back up in advance, this method will make us lose file on the drive.

A reliable way to fix/repair 'invalid volume header unsupported format' error

For the security of our files, we should firstly recover data from the failed drive with reliable Mac Data Recovery, and then fix this error by reformatting the drive.

Step 1: Recover data from drive that has 'invalid volume header unsupported format' error with iBoysoft Mac Data Recovery

iBoysoft Mac Data Recovery is a free & professional Mac data recovery software that can recover data from drive that has 'invalid volume header unsupported format' error, recover deleted files even emptied from Mac Trash, recover data from formatted drive, recover data from unmountable drive, recover data from unreadable drive, recover data from corrupted drive, recover deleted/lost partition, etc. on macOS 10.14‎/10.13/10.12 and 10.11/10.10/10.9/10.8/10.7.

Tutorial to recover data from drive that has 'invalid volume header unsupported format' error with iBoysoft Mac Data Recovery

1. Launch iBoysoft Mac Data Recovery.

Recover data from drive that has 'invalid volume header unsupported format' error

2. Select the drive that has 'invalid volume header unsupported format' error, then click "Next" to start scanning for lost files.

3. Preview scanning results, select files we need, and click "Recover" to get them back.

4. Go through the recovered files to ensure we have got all lost files back.

Step 2: Fix 'invalid volume header unsupported format' error by reformatting

1. Launch Disk Utility from Utilities.

2. Select the drive that has 'invalid volume header unsupported format' error.

3. Choose Erase, complete name, format, scheme, and then click Erase to reformat it.

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