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Contents: 1. What is AHCI/RAID drivers. Who needs them. 2. What s F6 floppy drivers for Windows XP installation. How do they differ from normal Windows drivers.
Change From IDE to AHCI Without Reinstalling Windows XP, Switch Disk Mode From IDE to AHCI, Change IDE to AHCI After Installation of Windows XP, Switch From IDE.
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I have a Gigabyte F2A85X motherboard. So recently i was checking the Device Manager and saw that Standard SATA AHCI Controller driver was of 2006. Wanted to.
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1. Intended audience
This 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. Also recommendations from this article are useful in
dual-boot configurations, where other OS must use SATA controller in AHCI mode, and Windows XP
as a first OS is using SATA controller in IDE mode.
2. Check prerequisites
Make sure your operating system is Windows XP. If you are using Windows 7 or Vista, then
read this article.
Reboot your PC, enter BIOS setup press DEL or F1 and make sure that currently SATA controller
is configured in IDE mode; and support of AHCI mode exists in BIOS.
3. 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 your
motherboard or notebook, or at the manufacturer s website. Also one can try to find the
SATA controller in the Windows Device Manager under IDE ATA/ATAPI controllers or Storage
Check your motherboard/notebook driver CD, try to find F6 textmode AHCI driver for your
chipset southbridge. F6 textmode AHCI driver consists of TXTSETUP.OEM, one or several
INF files s, SYS file s and CAT file s. SYS file is a driver itself, CAT file is a catalog
of digital signatures to verify integrity of the driver, and INF is an informational file
for Windows operating system how to detect hardware, and how to install/uninstall the driver.
For example, Intel AHCI driver for ICH10R chipset consists of iaahci.cat, iaAHCI.inf,
iastor.cat, iaStor.inf, IaStor.sys, and TXTSETUP.OEM.
If you could not find F6 textmode AHCI driver on the CD, check manufacturer s website
of the motherboard/notebook, and also check manufacturer s website of the chipset.
For example, for ASUS EEC PC 901 netbook with Intel ICH7-M southbridge, you should check
both ASUS and Intel websites. Also downloading latest drivers from manufacturer s website
may be helpful if old version of driver from motherboard/notebook CD was found, but didn t
work because of alleged bugs. But bear in mind that sometimes new version of drivers has
new bugs, not present in old version.
4. Perform upgrade installation of AHCI driver via Windows Device Manager
Right-click My Computer, choose Properties,
then Device Manager.
Expand IDE ATA/ATAPI controllers, then right-click on
Primary IDE Channel and choose Update
Driver from the context menu:
Choose not to use Windows Update this time:
Choose to install driver from specific location:
Choose not to use search:
Press Have Disk button:
Install From Disk window will pop up.
Press Browse button there:
Choose a folder where you have F6 floppy drivers for AHCI mode of your SATA controller:
Choose a proper INF file AHCI, not RAID if you have more than one:
Click Next :
Now reboot your PC.
5. During reboot, make configuration changes in BIOS setup
During reboot, enter BIOS Setup press DEL or F1 key and enable AHCI mode for your SATA controller:
Save changes when leaving BIOS Setup.
If you fail to change SATA controller mode in BIOS setup during this reboot, then Windows will
fail to boot with BSoD Blue Screen of Death. Stop code will be 0x0000007B:
6. Verify everything is OK, allow second reboot if necessary
Make sure that Windows loaded normally:
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, allow
second reboot if Windows asks for it.
Reasons 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 setup
during first reboot.
How to undo IDE to AHCI driver update revert to IDE mode :
Download and burn Emergency Boot CD,
you need a full version in this case.
Run EBCD Registry Editor, open
HKEY_LOCAL_MACHINE SYSTEM registry hive,
note the value of
Select Current NNN.
Go to registry key
and set value
it means loaded by
For example, your AHCI driver is called iastor. Go to registry key
it means started manually. Substitute your particular name of AHCI driver instead of
iastor as needed.
Save changed registry hive
HKEY_LOCAL_MACHINE SYSTEM to disk
F2 and exit EBCD Registry Editor.
Choose to reboot in EBCD main menu, go to BIOS setup and switch SATA controller to IDE
mode before Windows is loaded, otherwise you get BSoD with stop code 0x0000007B:
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