I see that, amongst others, the Intel NUC site lists the below drives as tested and approved for 5th generation. These aren’t SATA are they?
128 GB: SM951 series
256 GB: SM951 series
M.2 PCIe* X4 AHCI SSD
As this thread has gone quiet now, perhaps @support might be able to comment as to whether an M2 SSD would be recognised as storage if added in this instance, where ROCK already resides on a 2.5 SSD. Also, even if were, would it still be better to start from scratch with the OS on an M2 drive and a bigger 2.5 drive added for storage.
It may work, but you’d have to try. My guess is that it would work just fine.
It’s not a situation we expected to support.
I just resurrected this old thread to say that I added a Western Digital Blue 1TB M.2 SATA to the NUC5i5RYH and it was indeed recognised as storage.
Nice work. I have the same NUC as you albeit my storage is on an external USB drive. Hope you are enjoying it!