Still does not offer me the "New Mirrored Volume" option in the drop down (not even a grayed-out version). Ran suggested fix several times in various permutations, updated motherboard and SSD drive firmware and drivers, and ran the Windows updater, but Disk Management shows Drive 1 & 2 as Basic, Online, no drive letter, Unallocated and drop-down still only offers options for Simple, Spanned, Striped, Properties, and Help. Tried Dynamic Disk instead of Basic, too, and they are currently GPT. Using a MSI Z790 Carbon motherboard, i9-13900 processor, Windows 11 Home (flash drive), WD_Black SN850X drives in M2_3 & 4 slot (off Z790 chipset). Any more suggestions on how to get the Mirrored Volume option to be offered?