Error "we have detected that some of your hard drives are configured in a way that is not supported by DxO PhotoLab." (macOS only)

This information applies to all versions  - macOS only

In many cases, this message appears because a disk image (*.dmg) is currently mounted — for example, if you have just installed another DxO application such as the Nik Collection or DxO ViewPoint.
If that’s the case, the warning can be safely ignored or resolved by simply ejecting the disk image. No further action is required.

However, if no disk image is mounted and you still see the error, the issue is likely caused by a more technical problem with your drive configuration.

When using external hard drives, you may encounter a situation where DxO PhotoLab warns you about an invalid configuration. This is because DxO PhotoLab uses each volume’s UUID (Unique Identifier) to distinguish drives, since they may have the same name.
If you receive this warning, it means some of your volumes have identical UUIDs, preventing DxO PhotoLab from distinguishing them. The error dialog will indicate which volumes are affected.

To check the UUIDs of your volumes, follow these steps:

• Open the Apple menu and choose “About This Mac”.

• Click on “More Info…”.

• In System Settings, scroll down on the right and click on “System Report…”.

• In the left pane, under “Hardware”, select “Storage”.

Clicking “Storage” will show a list of drives and devices connected to your system. When you select one, its information — including the UUID — appears below.

To list them all together, click the top item in the list, hold the Shift key, and click the last item. All items will then appear together, and you can compare UUIDs.

This situation often occurs when purchasing two identical hard drives from the same manufacturer. They frequently duplicate volumes from templates, which results in identical UUIDs.
The same thing can happen if you clone a volume using specific software.

If you're using such volumes with DxO PhotoLab, images may not display properly. You might open a folder and be told it contains no images — even though it does.

Here’s how to resolve the issue:

• Reformat one of the drives to assign a new UUID. ⚠️ Be cautious: this will erase all data. Back up your data before proceeding.

• Alternatively, if you have the technical knowledge or support, you can change the UUID without reformatting using the command line tool hfs.util with the -s option. Again, make a backup to prevent data loss.