SimonD

I don't have any virtualization tools installed. Hyper-V is also not active. I thought Macrium Reflect could cause the problem and removed it. Unfortunately it's still not working. Is there any possibility how to troubleshoot this?

Thanks for your fast answer. I added the drive to Windows Defender whitelist and also deactivated all Defender features but it still did not work. I don't use 3rd party security software. Regarding virtualization I have to check.

I have an issue using the Disk Benchmark feature. It's the same on the latest 7.x version and also on the latest 6.x version. I activated "Write tests" under options and tried to use the "Linear Write" benchmark but it did not work. After clicking "Start" button I was asked three times if I want to continue destroying all data. I click yes and then the error "cannot open drive" occurs: I checked with Process Explorer and saw a sharing violation. Read tests are working but all write tests are failing with this behavior: Is this a bug and if not how can I fix it?