You need a driver for that controller, as the driver provides the RAID functionality. I don't think your going to find a driver for 2012 or 2012 R2. The controller is a software based raid controller. Your best option is to just keep the contrioller in SATA mode and use the RAID function of your OS
The controller has options for reparing/replacing failed mirror, but this isn't an option without a driver. I'm not familiar with how Windows handles a disk failure when Windows is providing the RAID services.
Intel r 82801er sata raid controller driver
Download: https://shurll.com/2vzqyF
I'll start with why you cannot use AHCI mode without modification. When Windows is installed, it only installs (enables) AHCI/RAID drivers if you have a storage controller it recognises as AHCI/RAID. Windows Vista and 7 would (usually) have the drivers anyway, but typically disable them. Vista and 7 come with a generic AHCI driver, with a more hardware-specific driver potentially available from the controller manufacturer. A manufacturer provided driver is necessary for 'FakeRAID'. The generic AHCI driver can be enabled with two quick, easy registry modifications.
Motherboard manufacturers often include an AHCI driver on a CD or on their websites. This driver is provided by the manufacturer of the storage controller, typically Intel on systems with an Intel CPU. Some other candidates are nVidia (nForce) and Marvell (on some AMD boards). They are generally not interchangeable.
Then it's all dependant on your controller manufacturer. There are many registry scripts that can insert the correct registry entries (the driver file is required, and a download is often provided). Since this is very specific to what hardware you have, you'll have to provide that information or search yourself (Google is a good place to start).
Personally, I recommend the non-registry method if you can get away with it. This involves selecting the SATA controller entry(ies?) in the device manager and using the Update Drivers option to select the AHCI/RAID drivers you should obtain from the manufacturer. For Intel, it should be manually extracted from the installer package. Some people note that nVidia change a hardware ID in IDE mode so this method may not be possible for nForce chipsets. It all depends on your controller manufacturer.
In the folder where you copied that file, double click on it and it will open a command-line prompt asking for confirmation to extract the files. Type "yes" and then enter. Several files will be extracted at that folder. these are the actual drivers.We'll need these files to tell the Device Manager where to search for the drivers. Open the Device Manager and expand the "IDE ATA/ATAPI controllers" node. In my case, there were listed the regular IDE channels, and a couple of generic Intel ICH10 SATA controllers. These were the generic drivers installed by Windows, and I can tell you for sure that these don't work (tested enabling AHCI in BIOS and trying to load the OS resulted in beeps and reboots).
Select one of the SATA controllers -> Right click over it -> update driver -> Install from a list or specific location (Advanced) -> check the "don't search" radio button and click next -> click on "Use disc" -> click on "browse" button and select the folder with the drivers from wherever you have copied them. If you have the drivers in a CD or DVD, make sure it doesn't contain an AUTORUN.INF file at the root folder, because the file picker dialog is looking for .INF files and it won't let you browse to subfolders.
You need the southbridge version because when you install a driver through the update driver for the ata storage controller through the device manager, it will give you a number of versions... If you choose the wrong one you may find yourself unable to boot and having to reinstall your image like I did...
The procedure that worked for me for the P5GD1 Pro (and so likely any other mother board) was to use the intel AHCI folder on the driver disc (if not got you can could on google or something for 82801FB drivers) then simply update the driver in the device manage for the ATA storage controller. Choose have disc and browse for your driver file for intel, or whatever version you have, and then choose the driver which matches the southbridge version for whats indicated in CPUZ. Using CPUZ to identify your southbridge will save you doing what I did and having ot find out the hard way. Then reboot which windows will ask yu to do anyway, enter the bios and enable AHCI for the IDE configuration. It should then boot and install the discs then ask for another reboot.
a. open IDE ATA/ATAPI controllers (click on +)b. right click the first Intel controller listedc. select "Update driver..."d. select "No, not this time, Install from a list or specific location (Advanced)"e. select "Don't search. I will choose the driver to install"f. select the Standard Dual Channel PCI IDE Controller and click Next (do not reboot)g. repeat steps c. to f. for the second controller
a. open IDE ATA/ATAPI controllers (click on +)b. right click the first Standard Dual Channel PCI IDE Controllerc. select "Update driver..."d. select "No, not this time, Install from a list or specific location (Advanced)"e. select "Don't search. I will choose the driver to install"f. click on "Have disk" and browse to the directory with the AHCI driversg. select the iaAHCI.inf and click Nexth. ignore any warnings and reboot
Pentium 4 HT on an Asus P4P800 Deluxe motherboard with an ATI Radeon 9500 AGP graphics card and the restricted ATI driver installed via Envy_NG. I have 3 IDE drives (two attached via the main IDE controllers and one on the VIA VT1640 controller) and an eSATA drive (on one of the onboard SATA controllers), with a mixture of software RAID1 and RAID5 and non-RAID EXT3 and NTFS partitions. 2ff7e9595c
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