Periodically, when you turn on or reboot, not detecting hard drives in IRS Raid controller BIOS (Ctrl+I). At the same time Hard drives are defined in the MB BIOS without any problems. Hard drives six pieces WD2004FBYZ. When hard drives are determined normally, everything works fine. The power supply is changed. Sata cables changed.
CPU I7-6700K
Memory 64Gb
Video HD Graphics 530
PS 500W
I figured why not be determined drives in the controller BIOS raid. When you turn on or reset the computer hardware Sata ports are allocated randomly, that is, the same hard drive is connected to another Sata port than to reboot. Every time a hardware port Sata is another. If you turn off and turn on the computer or doing relief and achieve initial coincidence location Sata hard drives in the ports, Raid detect all the disks and starts rebuilding data. This is clearly seen on screen in the example Raid1 hard drives. Here's an ambush.
http://www.picshare.ru/view/7251045/