Found a working 2011 patchcode here:
Worked on my 17 inch late 2011 perfectly. Also for the inexperienced pretty good instructions I'd say.
It's on the forum now where it belongs
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Hi, i'm Italian, sorry for my english.
I have a 27" iMac 10,1 late 2009. I have installed a samsung 840 evo 250 GB instead superdrive.
I have 1TB mac original 7200 rpm hard drive and the sad instead superdrive. I have 2 partitions in SSD one with mavericks and the other with windows 8.1.
Can i enable AHCI mode? What is the correct procedure? Exist a program? Thanks
i added a Samsung 840 EVO 250GB SSD to my Mac Mini mid 2011 and Windows 8.1 Pro.
Got it working with the original patchedcode.bin and the following steps:
Process I used:
1. Checked the registry that
HKLM/System/Current Control Set/Services/storahci -> Start = 0
HKLM/System/Current Control Set/Services/iaStorV -> Start = 0
Also in both keys /StartOverride -> 0 = 0
3. Reboot into the OS X setup disk, open the Terminal utility
4. unmount all volumes on my SSD
"diskutil umount /dev/disk0"
5. Backed up old MBR
"dd if=/dev/disk0 of=backup.bin bs=512 count=1"
5. Overwrite the MBR with
"dd if=patchedcode.bin of=/dev/disk0 bs=440 count=1"
Also i did not have to install any SATA drivers.
Just wanted to share this because the first post mentioned that it would not work with the aluminium minis.
EDIT: Using the Intel RST driver nearly doubled the IOPS.
EDIT: Sleep doesn't work, second drive (HDD for me) works.
To all of you in that forum:
I like to say thank you!!
I have a Mac Pro 3.1 (early 2008) with a Samsung SSD 840 EVO in two boot partitions: one for OS Mountain Lion, one for Windows 7 Pro.
Your AHCI enabler worked perfectly and Win 7 bootcamp is running better and faster than before!
Hello! I need a little help here. I have a Macbook Pro 5,1 mid 2009, with the nVidia MCP79 chipset and i would like to enable the AHCI support on it, but im not really sure the steps i should follow in order to get it enabled. Can some help me making a step by step instructions on how to do it? I would really appreciate it.
I have read a lot of stuff and most of this thread, but im kind of confused. Saw the info on the first post about making it work on MCP79 chipset, but im not really sure what to do with it.
I modified the AHCI code in the script by johnsock and ludacrisvp to modify the reportedly necessary register for the nVidia MCP79 (9C=60h). I tested it on a Mac 10,1 and it sets the register as expected. This was verified under Win7 with pcitools.
However, I could not seem to get the AHCI working as the performance was unchanged. I tried the "standard AHCI 1.0 compatible controller" driver included in windows, as well as the nVidia nForce WHQL driver and even a Dell laptop driver just in case (each with the reg set/unset). The windows driver is stable, but the nForce drivers nope out to BSOD on boot.
If anyone knows of other registers or drivers that should be used please let me know.
I can't find how to attach the script so here is the necessary AHCI_CODE for now:
old AHCI_CODE=66B890FA0080BAF80C66EFB060BAFC0CEEC3 66B8********BAF80C66EFB0**BAFC0CEEC3 9C580080 06 new AHCI_CODE=66B89C580080BAF80C66EFB006BAFC0CEEC3
Note, this AHCI code only works for the following configuration, which is on iMac 10,1:
PCI CONFIG_ADDRESS: bus number = 0 dvc number = 0B fnc number = 0 reg number = 9C PCI CONFIG_DATA = 06h
As the forum seems to have suffered from some massive data loss I'm re-uploading the AHCI Enabler application.
If that code works I've added it to this version of AHCI Enabler.
I've also added definitions for various MCP79 chipsets so hopefully it will be able to patch those systems. As I don't have one of these computers this is a complete guess and may not work at all.
Please test it out and let me know.
IM getting errors trying to use this on yosemite any fixes ?
Unfortunately the Beta MCP79 AHCI Enabler did not work for me. I have a Macbook Pro5,1 running OS X Mavericks. The Enabler detected my chipset as MCP79 but said it was an unsupported chipset.
Hi, I have a Mac Pro3,1 running 10.10.3. I have a 250GB Samsung EVO 850 which has a split partition for OS X / Windows 7 Ultimate 64-bit.
I have followed the instructions found here (which seem to be mostly identical to the instructions on the first page of this thread.)
The Microsoft AHCI drivers were installed. However I could not proceed and install the Intel RST drivers -- the latest, and oldest version give me an error saying my platform (or computer requirements, in the case of the later) is not supported. I found the newest Intel Matrix Storage Manager driver and installed that correctly.
Is there any way for me to update to the RST drivers? (I tried "automatically find drivers" in Intel's Driver Update Utility with no success, as well as installing RST after MSM.) Or should I just be content with the MSM drivers?
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