How to change the hard disk mode of WIN7 BIOS?

After changing the following registry, change the hard disk mode to restart: Note: The IDE changes to AHCI, the registry value is changed to  0”, AHCI to IDE, the registry key value is changed to “2”. Windows Vista, 7 system, type regedit command in "Run",

Start subkey under HKEY_LOCAL_MACHINESystemCurrentControlSetServicesMsahci, right click /& ldquo; Name & rdquo; column & ldquo; Start & rdquo; /select & ldquo; modify ” In the “Value Data” box, type “0”,“OK" and exit the Registry Editor.

Second, reboot into bios, the IDE mode to ahci, or some machine is SATA MODE --- enable

Third, due to the system since Windows 7 With AHCI driver, it will be installed automatically after rebooting. Special note: If the first step is wrong, then after the second step, a blue screen will appear and the system will automatically restart and cannot enter the system.