Google on changing from IDE to AHCI mode, and you should find a link to Microsoft, where instructions are given about the registry update to allow that change. They also have a small program that does that for you. You will need to load the AHCI driver as you said.
It is about a laptop with Vista on board, Intel 965 PM Express and a single classic hdd (no ssd).
No further hard disks are present in system, no RAID possible nor aimed.
The OS (Vista 32bits business) was installed originally with host controller set to AHCI,
the Intel Matrix Storage stuff was installed.
Some time ago the the Intel software was removed mistekaly by user.
In order to recover the controller was set in bios to IDE mode and appropriate registry keys
HKLM\System\CurrentControlSet\services was activated in order to boot in IDE mode instead of AHCI.
The recovery succeeded. So the PC operates now after recovery in IDE mode.
How to switch now back to AHCI mode coupled with Intel drivers from Rapid package.
How to proceed?
The Intel Rapid package is to be installed first then reboot with changing bios to AHCI or similar?
Will the installation of Intel driver set all appropriate registry keys in HKLM\System\CurrentControlSet\services accordantly
or has it to be made manually?
I have this procedure on file. However, I have not verified this to work(don't have the time). It is claimed to work for Vista and Win 7.
1) Run the Registry Editor (regedit.exe)
2) Navigate to Registry Key: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Msahci
3) Set the "Start" value to 0 (zero)
4) Navigate to Registry Key: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Pciide
5) Set the "Start" value to 0 (zero)
6) Shut down
7) Start up again, but before Windows boots go into the BIOS configuration screens and change the
disk mode to "AHCI". Save the new BIOS configuration and restart so that Windows boots.
When Windows starts, it will detect the change, load new disk drivers, and do one more reboot to
start up with them.
I did consult Google regarding this question yet before raising this thread.
All articles/discussions were found address the case where Microsoft drivers for AHCI mode
I am aware how the setup of registry keys in CurrentControlSet is to be made to achieve
the aimed goal.
However, the asked question is a little bit other. The main question at which procedure
stage the Intel drivers from Rapid package are to be installed? In the beginning or later stage?
This PC operates now on Microsoft IDE controller driver after the user has mistakenly removed
the Intel Matrix Storage Package inclusively Intel host controller driver.
Yes, the os is operating thanks to manual manipulation of the appropriate reg keys to use IDE mode while booting. That operation was performed on other healthy Win installation.