Re: Does anyone know the best way to deal with this? Can I update the 16 gig intell drive or can I disable it?  16 gb is so small.  If that is not a typo, you might as well remove it from system to save the trouble of dual boot.  Do you mean you installed a 4g or 40GB hdd?  4g is not enough to hold Win 10.
I'm working on my xps8930 and seeing some stuff that I'm not clear about. This system came with a small 16gig intell ssd drive installed. I'm not sure what's on this drive but it looks like maybe it has boot manager and some recovery stuff. I installed a 4 gig hard drive with a fresh install of win10. Now when I boot up I see 2 options for win10. If I select the one that is on my 4 gig drive, it boots and every thing seems fine. If I select the other one, the system fails to boot. It gives an that a required device is not found. I assume this it pointing at the old drive which I have removed. Does anyone know the best way to deal with this? Can I update the 16 gig intell drive or can I disable it? 
XPS 8930, two Windows 10 Boot Managers