In your computer managment , does it show Partitions?? on your drives??
You may have to reinstall windows but manuely set the partitions on the RAID
No that's not it but I appreciate the effort Robert.
Uninstall Intel Storage volume software and restart.
Go to storage in Computer Management and unallocatte the second drive. Then expand the initial drive to take full capacity of both drives.
You can then reinstall the Intel software if you want..not really necessary since TRIM is not available for Raid.