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Windows 7: AHCI mode

27 Dec 2009   #11

Windows 7 Home Premium 64bit

Quote   Quote: Originally Posted by RogerR View Post
Quote   Quote: Originally Posted by Wishmaster View Post
If the results are the same or minimal, Id just use IDE for compatability reasons.
Compatibility with ..?

All my drives are SATA.
For the sake of simplicity. To prevent switching back and forth when needed.
Although this is very rare, and quite easy to manage, some prefer not to be bothered with it.

As Qdos said, and i agree, theres really no dis-advantage of AHCI.

I've only ran into a couple instances where it was a issue, and even then no big deal.
1 specific example was a firmware update for my SSD.
I had to enable IDE mode, do the firmware update from my USB stick (outside Windows), then re-enable AHCI before rebooting back to Windows.

So there may be small issues such as this. So just be aware. Others may not have the same experience.

As far as 99.9999% of everything else, in my experience, no issues at all.

I apologize for the confusion, I should have been more clear by what i meant.

My System SpecsSystem Spec
08 Feb 2010   #12
Bare Foot Kid
Microsoft MVP

W 7 64-bit Ultimate

I just wanted to add a link to this new tutorial here at Seven Forums!

AHCI : Enable in Windows 7 / Vista
My System SpecsSystem Spec
08 Feb 2010   #13

Windows 7 Ultimate x64

Quote   Quote: Originally Posted by Qdos View Post
There's no disadvantage to AHCI. No downsides at all. NCQ has been shown to have it's advantages - but for anyone who possesses an external SATA dock or drive, the hotswap ability is a quintessential feature.
I disagree. When i turn on AHCI on my Gigabyte GA-EP45-UD3R under both my SSD and my Western Digital Caviar Black, my speeds are slightly slower under AHCI.

Plus, there is an 8 second additional delay (during my already long enough 20 second Power on to complete POST) to initialize my controller in AHCI mode. I'm not convinced in an average hour or two of use that I make up that 8 seconds that I lose for sure during each and every boot.
My System SpecsSystem Spec


 AHCI mode

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