It sounds like you're running into an issue with the HP Smart Array B320i RAID controller not being recognized by the Linux distribution you're trying to install (openSUSE Leap).
Based on the troubleshooting steps you've described, it seems you've correctly downloaded and extracted the appropriate HP proprietary driver for the B320i controller and created a bootable USB drive using the dd command. However, the openSUSE installation is not recognizing the driver on the USB drive during the installation process.
There are a few things you can try to resolve this issue:
Double-check that you've selected the correct USB drive in the openSUSE installation process when prompted to load the driver.
Make sure that the driver version you're using is compatible with the version of openSUSE you're installing.
Try using a different USB drive or USB port to create the bootable driver disk.
Check if the HP Smart Array B320i RAID controller is supported by openSUSE or if there is a work around.
If none of these solutions work, you may need to consider using software RAID instead, as the HP Smart Array B320i RAID controller may not be fully compatible with openSUSE.
You can try talking to one of the community experts on the HPE communtiy for further clarification. They respond quickly. https://hpe.to/66013k1Rb