Install Window7 in IDE mode and change it back to achi

Install Window7 in IDE mode. Change to the method of achi to reinstall the system some time ago. In the past, the system was Windows 7 of ghost when the new machine was purchased, and the hard disk mode was changed to IDE, this reinstallation forgot to change to the achi mode. After forcibly changing the bios to the achi mode, win7 will continue to restart and cannot enter the system. However, the system has been installed, and it is too troublesome to reinstall it again. Therefore, you can find a solution on the Internet to modify the registry. The solution is as follows. 1) In IDE mode, go to win7, find the Registry HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ services \ msahci, double-click the Start option on the right, and change its value to 0. 2) restart the SYSTEM, enter bios, change hard disk mode to achi, save and restart. 3) after entering win7 normally, the system will automatically install the achi driver. OK. I believe it is unnecessary to say that the speed is faster than that of traditional IDE. But this time I did a test before and after the modification. The tool is HD Tune Pro 4.6. The read speed of the hard disk before and after the modification has not changed much, basically the same. However, since you are using a sata hard drive, changing it to achi will theoretically achieve better performance.