That is strange and I can't say I have seen that one.
Your boot drive needs to be the first drive in the boot order.
if not it will try to boot to the drives with MBR in the order they are configured in BIOS set-up.
Also You photo shows you on BIOS 48. Latest BIOS is BIOS 60,
thank you for this reply, I also trusted Intel, that bios on this link is latest as stated:
but I did found the BIOS 60 and I will try it.
Also upgrade to BIOS 60 and backplane firmware to 2.15 didn't help.
I have second same box with exact same behavior.
I am able to boot machine with SATA set to enhanced mode, but hotplug is supported only in AHCI mode.
Thank you for the reply.
Also my drives are WD1003FBYX, which is supported.
ESRT2 works. But it is not so comfortable as AHCI, becouse you have to flag drive as array member even when you are using mdadm raid.