Studio XPS 8100, Windows 10, SATA RAID seen as SSD

I continue to troubleshoot hang-ups and slow performance from my trusty old Studio XPS 8100 now running Windows 10. Noticed the SATA HDD RAID 1 can't be optimized as it/they are incorrectly identified as SSD. Any advice on how to address this? Have downloaded the BIOS update supplied from Dell S8100-A05 but haven't installed it yet.

Thanks in advance for any help!