"To improve system performance, Lenovo is ... adopting RAID on the SSDs..."
From the Reddit thread:
"I got a reply from Lenovo on my Best Buy review about why the BIOS on my Yoga 900 ISK2 UltraBook has been set to stop people from using Linux."
Specs for the Yoga 900 ISK2:
http://shop.lenovo.com/us/en/laptops/yoga/900-series/yoga-900-13/#tab-tech_specs
It's a laptop with ONE DRIVE BAY.
So what possible benefit would putting SSD RAID on a laptop with one drive bay bring?
Pull the other one, it's got bells on.