I installed a new WD1002FAEX 1TB drive in my system with Windows 7 64bit on an ASUS M3N78-VM board. My  windows experience is 5.9 being this hard drive. It has two processors and I have an “unknown processor” with a yellow icon listed in my device manager. Now I read this article: So Do I have to reinstall windows to use ACHI and will it then be a fast system with the two processors? Can I switch without reloading? I did try switching from sata to ACHI in BIOS but the system won’t boot. Thanks

I believe it is AHCI and not ACHI. Anyway, just follow the instructions here.

Yes you’re right thanks. this is a sata 6 hdd and i wanted the extra speed of a two processor hdd.

I have heard of these new drives and they have one dedicated processor for I/O and other for Servo systems. I honestly don’t think that the yellow bang with “unknown processor” is not the one inside your drive. HDD processors were there since in beginning on HDDs but they are not transparent to BIO and don’t need separate driver. SO they won’t be translated as “Processors” on device manager.

Your Asus motherboard is using AMD AM2 or AM2+ CPU.  (AMD Phenom X4 Quad-Core Processor or X3 Triple-Core Processor) You may need to download latest mother board chipset drivers to support your new CPU. Or it may require a BIOS update. Check with Asus support.