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Windows 7 can't booting on AHCI but can on IDE

Last response: in Storage
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July 10, 2011 4:11:49 AM

for a year i recently used to AHCI mode for my HDD laptop.
but yesterday,
my laptop suddenly got blank screenn.
so when i try to boot on AHCI mode, the screen got stuck on "STARTING windows" i wait for an hour but still the screen did not go anywhere..
but when i try to change to IDE via BIOS.. the screen got no stuck..
so anyone have any idea how to change to AHCI mode again..

a b D Laptop
a c 209 $ Windows 7
a c 415 G Storage
July 10, 2011 4:40:07 AM

If your system works in IDE mode but not in AHCI mode then the following procedure should solve the problem:

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.
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July 10, 2011 5:59:24 AM

@sminlal.
both of them are 0 already.
because i used to AHCI before the problem occured.
i tried to use system restore, to restore the system files before the problem occured.
but still can't boot and always got stuck on starting windows (AHCI mode)
even in AHCI i can't run the safe mode got stuck when it tries to load SYSTEMPNP.sys (or somewhat like that)
but on IDE. it can run anything.
any idea?
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Related resources
a b D Laptop
a c 209 $ Windows 7
a c 415 G Storage
July 10, 2011 2:46:06 PM

It almost sounds like your AHCI driver may have been corrupted. You might try to use the Windows install disk to repair your installation. Sorry, I can't give you step-by-step instructions because I've never had to do it myself.
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July 10, 2011 3:22:32 PM

@sminlal
ok, i got the idea..
btw, you know the difference about ICE v AHCI?
i try using IDE now, and i feel this one is very bad on performance comparing to AHCI one.
or this just my imagination?
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a b D Laptop
a c 209 $ Windows 7
a c 415 G Storage
July 10, 2011 3:42:21 PM

There isn't a lot of real performance difference between IDE and AHCI modes. The two modes are just different ways for the OS drivers to communicate with the SATA chipset - the raw transfer speeds over the cable to the disk drive are the same in either case. It's not as if you had an actual IDE disk drive connected using IDE cables.
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July 11, 2011 4:10:42 AM

so that, it's ok either way using IDE or AHCI.
there's no major issue will occur?
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a b D Laptop
a c 209 $ Windows 7
a c 415 G Storage
July 11, 2011 6:34:15 AM

It should work fine in IDE mode, although the fact that your AHCI stopped working suggests you have some sort of issue that could potentially cause problems.
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Anonymous
a b D Laptop
a b $ Windows 7
a b G Storage
March 21, 2012 8:58:31 AM

I have just had the same problem - i have a vertex3 ssd disk as my boot/os drive and a conventional wd disk for storing files etc.

Iv'e had no problems until this morning when it got stuck on the Starting Windows (win7 64bit) screen and never moved off. I changed AHCI -> IDE in bios and it booted. I then set it back to AHCI and...it booted!

So if, as someone else mentioned, windows reloads the AHCI drivers when booting if last reboot was not AHCI (i.e. IDE) then it could be a corrupt driver issue i guess. All i know is it's working fine now :) 
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August 26, 2013 11:24:33 AM

sminlal said:

(...)
1) Run the Registry Editor (regedit.exe)
(...)

:bounce: A lot of thanks to you, sminlal! Your answer solves my problem.

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a b D Laptop
a c 228 $ Windows 7
a c 371 G Storage
August 26, 2013 12:35:16 PM

sminlal said:
There isn't a lot of real performance difference between IDE and AHCI modes. The two modes are just different ways for the OS drivers to communicate with the SATA chipset - the raw transfer speeds over the cable to the disk drive are the same in either case. It's not as if you had an actual IDE disk drive connected using IDE cables.


I do beleive that AHCI is required for NCQ, hot swap, and a few other features to be enabled.

http://en.wikipedia.org/wiki/Native_Command_Queuing

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a b D Laptop
a b $ Windows 7
a c 812 G Storage
August 26, 2013 6:15:04 PM

actually when using a sata3 port and drive there is a noticeable performance increase with ahci over ide. this is typically only seen when using an SSD.
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August 30, 2013 11:21:06 PM

sminlal said:
If your system works in IDE mode but not in AHCI mode then the following procedure should solve the problem:

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.


that totally solved my issue. i changed my sata from IDE to AHCI so I could take advantage of my new SSD and my old HDD windows won't boot. changing the first value from 3 to 0 fixed that and my HDD windows boots up! thanks a ton! :) 
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