My 8940 came the same way. SSD and HD. OS was installed on the SSD. Are you sure it is on the HD? Did you use Disk Management to look at it? On mine, looking at what the 8940 was shipped with, one could be confused possibly? [IMAGE] Disk 0 is the 1TB Hard drive, I partitioned into 2 drives (to match what I had on my old XPS for easy program/data transfer). The SSD, a 512GB one is listed as Disk 1, but as you can see, the C: drive is on it. What do you see with Disk Management?  
I recently purchased an XPS 8940 that came with a 1TB M.2 PCIe SSD and a 1TB SATA HDD. The OS (operating system) is on the HDD and the SSD is set up as a DATA drive. I want to reverse these and use the SSD as the main applications and OS drive and the HDD as the data drive. Can anyone share some info or point me to a good article or set of instructions for making this change?
XPS 8940, move OS from HDD to SSD