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Configure SATA as IDE or AHCI in the BIOS?
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Author:  Emoz93 [ 20 Feb 2011, 15:42 ]
Post subject:  Configure SATA as IDE or AHCI in the BIOS?
In the BIOS, my SATA hard drive is configured as IDE (default setting). The other two options are RAID & AHCI. I heard that using the AHCI option can increase the hard drive's performance. My mobo is Asus P5K Pro (P35/ICH9R chipset). Current OS is Win7 x64.

My questions regarding AHCI:
1. Do I need to do a fresh install of Windows after changing to AHCI?
2. Do I need to install additional drivers/software from Intel to use AHCI, e.g Intel Rapid Storage Technology or Intel Matrix Storage, after doing a fresh OS installation?
3. Will changing from IDE to AHCI have an affect on or cause issues to my DVD drive, which uses IDE?
Author:  scavvenjahh [ 20 Feb 2011, 16:59 ]
Post subject:  Re: Configure SATA as IDE or AHCI in the BIOS?
Okay I'm no expert but I had to do some research about this in my time, so here's what I gathered.

1. No you don't !

-In regedit, navigate to: HKLMSYSTEMCurrentControlSetservicesmsahci
Change Start value to 0.

-Reboot, enter BIOS, enable AHCI, and you're done.
Tested and approved by myself on two very different PCs :)

2. Nope, chipset drivers should take care of everything... :?:
3. You mean with a SATA DVD drive ? I... dunno :oops:
Author:  Emoz93 [ 20 Feb 2011, 17:11 ]
Post subject:  Re: Configure SATA as IDE or AHCI in the BIOS?
My DVD drive is IDE. There's no option in the BIOS to configure IDE devices. Maybe the IDE & SATA are on the same chip. There was one user who reported that his IDE DVD drive couldn't be detected by Windows after changing to AHCI, but managed to fix through the BIOS.
Author:  Delphium [ 20 Feb 2011, 19:01 ]
Post subject:  Re: Configure SATA as IDE or AHCI in the BIOS?
Your DVD drive should continue to work just fine.
I have a pair of IDE drives not sata, all my controllers are set to AHCI mode, yet the DVD drives remain in IDE mode as AHCI is only compatible with SATA devices.

IDE was superseded by SATA as it introduced a lot of advantages. AHCI (Advanced Host Controller Interface) is an application programming interface that defines one mode of operation for SATA. AHCI does not affect the speed at which SATA drives operate but it exposes the advanced features that are available with SATA.
http://www.differencebetween.net/technology/difference-between-ahci-and-ide/
Author:  Emoz93 [ 23 Feb 2011, 05:37 ]
Post subject:  Re: Configure SATA as IDE or AHCI in the BIOS?
Is the registry the same in 64-bit Windows 7?
Author:  Delphium [ 23 Feb 2011, 13:04 ]
Post subject:  Re: Configure SATA as IDE or AHCI in the BIOS?
Is the registry the same in 64-bit Windows 7?

Yes it is.

HKLMSYSTEMCurrentControlSetservicesmsahci

Emoz93 fyi, HKLM means HKEY_LOCAL_MACHINE.

I was able to find this setting on my Win7 x64 machine using the above path.
Author:  Emoz93 [ 27 Feb 2011, 07:30 ]
Post subject:  Re: Configure SATA as IDE or AHCI in the BIOS?
Good news: My DVD drive still works, in AHCI mode!


Bad news: Hopefully my lil' bro and I won't be dumb enough to accidentally eject the HDD instead of the USB drive.
Author:  MobsterOO7 [ 27 Feb 2011, 15:12 ]
Post subject:  Re: Configure SATA as IDE or AHCI in the BIOS?
Just set that icon to never show in the system tray.
Author:  Paradigm Shifter [ 09 Mar 2011, 14:00 ]
Post subject:  Re: Configure SATA as IDE or AHCI in the BIOS?
Windows should just tell you that the drive is in use and impossible to eject even if you did click on it.
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