Why I can't install O.S. on SR-125ED server through single hard disk without RAID function?

Please confirm your ACARD Model on POST screen because AEC6897 chip limitation, you need inot ACARD BIOS utility set hard disk to Boot device. FOR ACARD AEC6897 Ver1.2.4: Press F1 or F10 to get into BIOS setup utility, choose "SetBoot" and "SET BOOT DEVICE" hard disk as follwing illustrator.