Drives in a ready state will not be presented to the OS. Only virtual disks will be presented to the OS, you must create a virtual disk with the drive before you can use it. You can create single drive RAID 0's on the H710. Thanks
I can't seem to get Windows 2012 R2 Installer to detect any drives on my "new" (refurbished) r720xd.    I have done everything I can think of so... here is a list of things done: - Tried boot off USB then load the raid card (H710 mini) drivers.  No drives - Booted remotely using DRAC and then Load OS in lifecycle. No drives - Update BIOS and OS Driver install pack from ftp.dell.com then try everything again.  No drives   I was not trying to install on a RAID or anything just to a samsung 860 pro SSD.  BIOS and DRAC report all of the drives are ready (currently 6 installed), and it can see the HDD/SDD info on all of them as well.   I am out of ideas since loading the up-to-date drivers seems to have worked for everyone else in the forums here. (Yes I did look for a solution first) 
server 2012 R2 installer cant see any drives on r710xd