I want to know the meaning of "ACHI" in different language

I am not sure how to answer you but if your refering to the word "ACHI" as a language then It means older sister in Chinese. Here in our country, Philippines, it's basically use to call an older sister. Although its a Chinese word I think most Filipinos have adapted using it. :-)

Achi; stands of good in Urdu, Urdu is national language in Pakistan.

From what I read : AHCI stands for Advanced Host Controller Interface. Its an intel specification for SATA, heres a link to intel that will explain it a little better http://www.intel.com/technology/serialata/ahci.htm also check here: http://en.wikipedia.org/wiki/AHCI Your manual indicates that you can choose EITHER RAID or AHCI support. It's not clear if the SATA drives have AHCI support in RAID mode (my guess is they do not). The primary benefit of AHCI with your system would be support of Native Command Queueing (NCQ); and this is only true if your SATA drives support NCQ. Bottom line: Don't worry about it :-)