Switch OS to AHCI not working even with regedit fix (Win 2008 R2)

amirh1

Distinguished
Jul 30, 2003
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18,510
Hi,
just purchased a Samsung 840evo and cloned OS drive to it. Boot works great, drive is fast, now the utility tells me I don't have AHCI enabled. So I've followed various posts on how to enable Windows to load AHCI drivers w/o OS reinstall but I still get blue screen whenever I'm booting. With more detail:
* I've changed HKEY_LOCAL_MACHINE_System_CurrentControlSet_Services_Msahci : "Start" to 0 (did the same with pciide and iaStorV) as http://support.microsoft.com/kb/922976 suggests.
* When I change the BIOS to AHCI I get blue screen, and even safe mode doesn't work. When I change back to IDE, all is well.
Various forums suggest that this regedit solution indeed works w/o OS exclusions - has anyone come across a reason it shouldn't work for my setup?

System Information:
OS Name Microsoft Windows Server 2008 R2 Enterprise
Version 6.1.7601 Service Pack 1 Build 7601
System Manufacturer Gigabyte Technology Co., Ltd.
System Model EP45-UD3P
System Type x64-based PC
Processor Intel(R) Core(TM)2 Duo CPU E8500 @ 3.16GHz, 2834 Mhz, 2 Core(s), 2 Logical Processor(s)
BIOS Version/Date Award Software International, Inc. F9, 4/16/2009
SMBIOS Version 2.4
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "6.1.7601.17514"
User Name AH-SERVER\Amir
Time Zone Pacific Standard Time
Installed Physical Memory (RAM) 8.00 GB
Total Physical Memory 8.00 GB
Available Physical Memory 4.21 GB
Total Virtual Memory 16.0 GB
Available Virtual Memory 11.8 GB
Page File Space 8.00 GB
Page File C:\pagefile.sys
 
Solution
I have tried various tweaks to enable AHCI with a active install and have never got it to work correctly the only option I have found to work was setting the UEFI or BIOS to AHCI and then doing a format install of the OS.
G

Guest

Guest
I'm curious how much you have on the Evo. If it's just the os, could you reformat it, set the ahci in the bios, and then clone the drive again?