

Windows can access all the BIOS-equivalent EFI settings with the drivers that were installed by the Boot Camp Assistant. Why do you answer if you don't know? Macs use a new extensible firmware interface (EFI), instead of a BIOS. This is a bit unnecessary, don't you think? I just wish that Apple would fix this in Boot Camp Assistant, but I guess they want Windows to run slow in their hardware. There are some rather complicated fixes to enable AHCI in Boot Camp Windows and BOOTICE, as mentioned above is one method. I guess that the AHCI issue is the same as with 3d party SSDs and TRIM in MacOS, Apple don't want us to use cheaper 3d party stuff. Without TRIM on that partition that Windows will get slower and slower. For example you wont have TRIM support on your SSD Boot Camp Windows. The problem is that for 3d party disks (some say that it goes for Apple disks too but I haven't tried that) the Boot Camp Assistant disables AHCI support for Windows in Boot Camp and forces Windows to use ATA controller disk drivers instead (pciide instead of iastor), which is considerably slower than AHCI and has less features.
