These drives should be installed separately.
Go into your BIOS,
3. under sata controllers there should be an option to set your SSD to AHCI mode,
4. enable hotswapping,
5. save and exit.
Do this BEFORE you install windows.
Also, don't format or defragment your SSD. It will reduce life cycle of your SSD.
You can use programs such SSD Tweaker. This will optimize your SSD automatically.