Server was running software RAID 1 just fine.
One of the drives failed, so figured it was a good time to upgrade the disks.
Broke the mirror, imaged the good drive, replaced the disks, blew the iamge back onto the new disks, booted up smoothly.
Used EaseUS partition Manager to expand the drive size to use the full disk.
went into disk mgmt, added mirror to the System Reserved partition, went smoothly.
Went into disk mgmt, added mirror to C: and got an error stating:
"The operation failed to complete because the Disk Management console view is not up-to-date. Refresh the view by using the refresh task. if the problem persists close the Disk Management console, then restart Disk Management or restart the computer."
After doing both, I get the same error.
ran a chkdsk, no errors.
ran windows update - all updates are installed.
Resized the source partition to 17MB smaller - I've seen small size mismatches cause problems before - no change.
After everything, I get the same error.