It remains the same drive, but UEFI booting is used instead of legacy. Your BIOS manages both modes for compatibility. I believe you now have all the details needed to resolve this issue—everything you need is here. Also, a UEFI hard disk refers to a storage device placed in a different location, often with priority settings or similar configurations. Set your drive as the primary one and you'll see its name listed.
I wasn’t sure what to do, so a Windows reinstall seemed like a last resort. It also runs quickly on an M.2 NVMe SSD.
I understand you're experiencing issues. It seems the problem persists even after restarting your PC with UEFI and using the hard disk in the first drive slot.
When you open Windows Disk Management and verify the SSD format, look at where it says MBR or GPT. Click right-click at the drive 0 label (it might show a different number), then select Properties and go to the Volumes tab. The partition type should read GUID Partition Table (GPT).
Sure, I’ll give both a shot. I’ll turn off the legacy settings and start with just UEFI because it’s easier and quicker than dealing with everything. If that doesn’t fix it, I’ll move forward. I’d rather skip all the fuss and discover that a straightforward UEFI upgrade would have worked instead.
I’m wondering if it could be a GPT model. Would it be possible to adjust it without needing a new storage device?