mSATA SSD Disappeared!

After upgrading to Windows 10 this M17xR4 started booting very s l o w l y. I did not think much of it because it rarely gets shut down. Well, this morning I decided to try and find out why is boots so slowly. Come to find out that the 64GB mSATA SSD boot drive has disappeared. Windows 10 was loaded onto the 750GB HD. Device Manager does not even recognize the existence of the SSD--I've tried scanning for new hardware and their is nothing to be found. Troubleshooting ideas will be appreciated.