It seems like you are facing an issue where Windows is not automatically assigning a drive letter to your data drive upon startup. This can be quite frustrating, but there are several potential solutions we can explore to resolve this problem. Let's walk through some troubleshooting steps based on the information you provided:
1. Check Disk Management:
- As you mentioned, you have to manually assign a drive letter every time. Let's verify if the drive letter is being assigned but not retained upon restart.
2. Update Motherboard BIOS:
- Updating the motherboard BIOS (also known as firmware or UEFI) could potentially resolve issues related to drive recognition and initialization during startup.
3. Reconfigure RAID...