AJA system test error: "Test Failure: Could not write to / Volumes / ..."

AJA System Test Error message due to lack of write access to the hard disk.

The software "AJA system test"I've been using it for a long time to measure hard drive benchmarks. I recently used it to examine two SSD drives from SanDisk and Teyadi. As long as the hard drives were still formatted to ExFAT, the speed test ran with the AJA system Test passed without problems. Only after I got it on APFS formatted and with my backup of the system hard drive or with a newly installed one macOS Mojave the mistakes started.

AJA System Test Error message due to lack of write access to the hard disk.

AJA System Test Error message due to lack of write access to the hard disk.

Test Failure: Could not write to ...

If you want to use a hard drive for a speed test that you already have with a bootable backup (in my case with Carbon Copy Cloner created), then you get the following error message:

Test Failure: Could not write to / Volumes / NAME_DES_VOLUMES

Please change permissions to allow write test.

At first I thought that macOS Mojave with its "sharp" security settings was responsible for this, but even if you use the AJA System Test System Preferences> Security> Privacy> Full Disk Access granted full authorization, this error continues to appear.

Set access rights correctly

The reason for this is due to the file rights that have to be changed for the volume. To do this, click on the icon of the hard drive / SSD, then press the key combination CMD + I to open the information window and then look at the bottom in the "Share & Access Rights" area.

Change of access rights in the info window of the test hard drive.

Change of access rights in the info window of the test hard drive.

Usually there is only "Read" under "everyone" in the access rights column. However, you have to change this to "Read & Write" so that AJA System Test can write files to the hard drive for the speed test. To make changes, click on the small lock symbol at the bottom right and enter your admin password. Then you can change the value to "Read & Write".

Once that's done, you can give Aja System Test a new chance. If everything went right, the test should pass without any problems.

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