When the Windows installer boots up, it looks for standard storage endpoints. If your motherboard has the Intel RST controller active, the drive is effectively hidden behind that controller. Loading the raw .inf text configuration files found inside the f6flpyx64nonvmd.zip folder bridges this gap, allowing Windows to communicate with the drive immediately. Step 1: Download the Correct Driver
Intel splits its storage architectures into two distinct packages:
Intel Rapid Storage Technology: How to Install f6flpyx64nonvmd.zip for Missing Drives