How to Enable AHCI in Windows 8 After Installation. A lot of users have been messing around with AHCI after installing Windows 8. IEEE 1394 Interface; Type: Serial: Production history; Designer: Apple Inc. Some users have reported that they can’t get Windows 8 to install without disabling AHCI. Here at i. TD, we haven’t faced any such issue though we have a quick fix for such a situation. It’s very easy to enable AHCI after installing Windows, although it isn’t visible to users as a simple switch on/off option. What is AHCI and why should you care? AHCI ( Advanced Host Controller Interface ) offers native command queuing and hot- plugging through SATA host controllers (Serial- ATA) for hard drives. In simpler terms, there’s no reason you shouldn’t use it. Updated method. A lot of feedback has been given with our visitors sharing different levels of success in the below method.
The method had worked for me and some users but an easier version for Windows 8 is below which seems to work for everyone. This is normally done by pressing the delete key during system boot. Update the ATA Drive setting in the BIOS from ATA Mode to AHCI Mode. Save the setting and restart your computer to boot into Windows. Windows will boot in Safe. Mode as per step 2. Open the command prompt again by following step 1 and run the following command to remove the Safe. Mode boot option: bcdedit /deletevalue ? Do you have to reinstall Windows 8 again? No. You can enable it without losing any data. Switch from IDE to AHCI after installing Windows 7 and Windows 8 without re-installing OS.Enabling AHCI in Windows 8 requires going through the registry ( yes, it’s still there! You still have to modify a registry key but the key is different now. Follow the guide below to enable AHCI in but make sure that you’ve backed up your data as well as registry, just in case. Exit all applications. Go to the start screen and type in Regedit. If you see the UAC (User Account Control) dialogue box, just click continue. Locate the following registry subkey: HKEY. Right- click on the entry name, select Modify, change the value from 3 to 0 and click OK. Open the Start. Override folder and locate an entry named 0 with a value of 3. Change the value to 0 by following the procedure in step 5. Restart and enable AHCI in your system BIOSQuick Alternate Method. If you don’t feel safe playing with your registry like I don’t with a neighbor’s dog ( except that I can handle a messed up registry but not a messed up dog ), I suggest you download the registry file I’ve uploaded here. Just extract the . Do the obligatory AHCI switch on from your system BIOS and you’re good to go. Disclaimer. As usual, the author and owner of this website aren’t liable for any loss caused by the above guide. If your neighbor’s dog bites you, your computer blows up or hard drive refuses to work, I hereby take no liability. Of course, if you say please, I’ll be more than happy to help. Just follow the 2nd method of editing the registry and ensure you make a backup before proceeding. Can I switch from AHCI to IDE without re- format/re- install? LOL. But, can I say HUH? I thought if I am going AHCI to IDE, I should not have to do ANY added things, like install/repair? As for 'why,' it shouldn't matter, but I will tell you anyway: The client does not need or utilize that added speed, nor the added features. They may save a Word or Excel doc every few hours. Additionally, it is my understanding that, if you had to rebuild, and you are in AHCI mode, then you have to hit F6 and load some added drivers? I am in Vista, so i'm not sure if that F6 step would be needed, since Vista supports ACHI natively. Don't need hotswap; don't need RAID; don't need no credit card to ride this train.. AND, with various threads I've read, most people state that there is NOT that much . Well, upon running Dell diags, the return code indicated the HDD was *TOAST*.. Change SATA Modes After Windows Installation. Just to put in here for n. Force users, n. Force boards do not support AHCI (with the exception of n. Force boards that include onboard graphic cards), and also don't send the TRIM command for SSDs. It can do NCQ through its controller though. The JMicron SATA ports do support AHCI, but you'd get worse performance running a HDD through these, than on the normal SATA ports. You can uninstall the Nvidia controller though in Device Manager and install Microsoft's IDE Controller, which can send TRIM commands for SSDs. Head to Device Manager (Open Start menu, type Device Manager), and click . Right click one of them and click . You will see the option to choose . Click this and click . After the controllers have installed, you will be asked to reboot again. SSDs will now have a slight performance boost with the TRIM command, and also regular HDDs also have a slight increase as well.
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