Power Failure, Unusable drive

I had RAID setup with 2 OWC Accelsior drives in my 2010 Mac Pro. Crazy Fast. But after power loss and a failing UPS, everything crashed and the RAID volume would not boot the computer. I restored from a backup and was unable to make the RAID work, so I just used one Accelsior drive. (so now non-raid)

Problem: The other Accelsior does not appear in SoftRaid Lite at all. It does appear in Disk Utility, but Disk Utility will not let me erase or partition the disk-- it has 3 unmounted volumes. First Aid completes successfully.

I'd just like to use the Accelsior as a regular drive. I'll try the RAID setup again at a later date. How can I regain use of the Accelsior?

Here is some info from Disk Utility:

Volume type : Physical Device
BSD device node : disk0
Connection : SATA
Device tree path : IODeviceTree:/PCI0@0/IOU1@7/PXS2@0/PRT0@0/PMP@0
Writable : No
Is case-sensitive : No
Volume capacity : 960,040,140,800
Available space (Purgeable + Free) : 0
Purgeable space : 0
Free space : 0
Used space : 960,040,140,800
Owners enabled : No
Is encrypted : No
Can be verified : No
Can be repaired : No
Bootable : No
Journaled : No
Disk number : 0
Media name : OWC Mercury Accelsior PCIe SSD Media
Media type : Generic
Ejectable : Yes
Solid state : No
S.M.A.R.T. status : Not Supported