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How To Change Disk Controller Mode From IDE to AHCI Without Reinstalling Windows XPDisk controller for SATA HDDs can operate in both AHCI and IDE compatible mode. You can switch between them the in BIOS setup. AHCI mode works faster and has more features, while IDE compatible mode requires no special drivers to install older operating systems like Windows XP. Unfortunately, if you decide to switch between IDE and AHCI after installing Windows, you will get a BSOD (blue screen of death) during the next boot.This article explains how to switch from IDE to AHCI after installation of Windows XP, how to change disk controller mode from IDE to AHCI without reinstalling Windows. Intended audienceThis article is for users who want to switch SATA controller from IDE-compatible mode(aka ATA-compatible mode) to AHCI mode without reinstalling Windows XP.Primary motivation for such a switch is to gain additional performance from disk I/O (SATA NCQ),especially for SSD hardware.
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Also recommendations from this article are useful indual-boot configurations, where other OS must use SATA controller in AHCI mode, and Windows XPas a first OS is using SATA controller in IDE mode. Check prerequisites. Make sure your operating system is Windows XP. If you are using Windows 7 or Vista, then. Reboot your PC, enter BIOS setup (press DEL or F1) and make sure that currently SATA controlleris configured in IDE mode; and support of AHCI mode exists in BIOS. Find or download F6 textmode AHCI driver for your SATA controller. Find out the name of your chipset (south bridge).
It should be in the user guide of yourmotherboard or notebook, or at the manufacturer's website. Also one can try to find theSATA controller in the Windows Device Manager under 'IDE ATA/ATAPI controllers' or 'Storagecontrollers'. Check your motherboard/notebook driver CD, try to find F6 textmode AHCI driver for yourchipset (southbridge). F6 textmode AHCI driver consists of TXTSETUP.OEM, one or severalINF files(s), SYS file(s) and CAT file(s).
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New detected hardware balloons may appear in the tray area after the first reboot after driver update.Also Windows may ask permission to reboot just after installing the drivers, allowsecond reboot if Windows asks for it. TroubleshootingReasons why it might not work:. You have downloaded a driver for wrong hardware, not for your chipset (south bridge). You have downloaded a driver for different operating system (not Windows XP). You have downloaded 64-bit driver for 32-bit OS or vice versa. You didn't switch SATA controller from IDE-compatible mode to AHCI mode in the BIOS setupduring first reboot.How to undo IDE to AHCI driver update (revert to IDE mode):.and deploy it to USB thumbdrive.
You need a full version in this case. Run Emergency Boot Kit Registry Editor, open HKEYLOCALMACHINESYSTEM registry hive,note the value of SelectCurrent ( NNN). Go to registry key ControlSet NNN Servicespciideand set value Start=0.
For example, your AHCI driver is called iastor. Go to registry keyControlSet NNN Services iastorand set value Start=3(it means 'started manually'). Substitute your particular name of AHCI driver instead ofiastor as needed.
Save changed registry hive HKEYLOCALMACHINESYSTEM to disk(F2) and exit Emergency Boot Kit Registry Editor. Choose to reboot in the main menu of Emergency Boot Kit, go to BIOS setup and switchSATA controller to IDE mode before Windows is loaded, otherwise you get BSoDwith stop code 0x0000007B: INACCESSIBLEBOOTDEVICE.