OK, I didn't set it up but was given a Windows Server 2012 that was setup with Mirrored hard drives (not RAID). Whoever set it up created a single partition C: for the entire drive. I want to create a C: and D: (for data) partitions.
I used Easus Partition Manager for Servers to re-allocate the C: to 100GB leaving the blank hard drive for a D: drive. I need to know how to create a D: drive that is Mirrored to the 2nd hard drive.