MAXIMUS IX FORMULA, BIOS 0801
1 m.2 ssd, 1 sata3 hdd, no raid.
So, as I understood, the IRST is viable not only when using raid configuration?
UPD:For those, who wonders about the IRST (Intel rapid storage technologie)
If you don't use raid-configurated drives, no need to install this.
But, this package not only containes the software to manage/operate raid's, it containes the driver for the sata/ahci controller.
You might want to update your driver via device manager, directing it to the IRST folder.
Without this driver your controller will be named something like standart sata/ahci controller, after the update - intel 200 series chipset family sata ahci controller.
Now will monitor the event viewer, hope the driver update will fix the error.