If you've installed Windows to the SSD, you will need to reinstall it.  If it's installed to the hard drive, you can enable IRST caching without reinstalling. [URL]  
Hi friends,I have had to change the 3.5" hard drive and re-install Window,All done and working well.In the process I discovered the 32GB SSD.W10 required 32 GB as a base.Was I supposed to install W10 on the SSD to speed the boot etc?(Surely with all the patches etc, the final updated W10 will spill out of 32gb?)Am I supposed to put W10 on SSD and just "hope" that any further space required will just find it's own way onto the other disc!? (They are not Raided as such, or a shared volume..)Surely, being so close to "full" will make Windows unstable on this SSD?Any clarity appreciated..
XPS 15 9550 - SSD - what's it for?