My dell xps 15 has 1TB HDD and 32G SSD. I've installed newest ubuntu on SSD (before that I've disabled Intel Smart Response Technology by setting ATA operation to AHCI in BIOS) and after that I've installed windows 8.1 on HDD. Strange thing is that I cannot disable Intel Rapid Start Technology because it is grayed out in BIOS.
The problem is that after a day of using both operating systems my Windows 8.1 fails to boot going to infinite loop of repairing etc.