So sorry for the delay. I basically let the issue drop. But it is still an issue. Please see the following:
So here is the latest skinny: the i3 and i5 Gen4 NUCs are a ticking time bomb! That's right! The moment you try to setup RAID....boom! I had 2 out of my 6 NUC fail on me! All this time I had not been using the secondary SATA port, and mistakenly assuming all was well. Now that I have enough of the proper spec SSD to use in RAID1, I discovered the two defective. Sometimes detects and sometimes not at all. Not good, Intel!!
Intel has addressed it, thank God. The fix is at this thread. I gonna need 6 replacements!
Intel HAS confirmed this issue and I desire resolution ASAP. Thanks!