How does Mac see if the hard drive is open Achi mode?

How does Mac see if the hard drive is open Achi mode? If it's a new Apple Mac, you don't have to worry about it, Apple will automatically open it for you! If you install a solid-state hard drive, and do not know whether their own Mac to open the Achi mode, then small editing to teach you how to see if the hard drive to open Achi mode.

First step, click on the Apple icon in the upper left corner, click on the menu to select "About this machine"

Second step, in the "Overview" window that appears, click on "System Report"

The third step, in the Mac window, click on the left "Sata/sata Express", left to see if there is a "ahci" content, if any, on the system to open the hard disk AHCI function, solid-state hard disk needs to see "ATA" project