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Windows 7: 25 second boot up delay after post/AHCI screens

15 Aug 2011   #11
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

Quote   Quote: Originally Posted by Tanyam View Post

Well, I've now isolated the problem. I reinstalled Windows and left it completely stock. No motherboard drivers, and no applications, no tweaks, nothing.

I then reset BIOS on Z68X-UD3R to fail-safe defaults.

I then changed things one setting at a time.

Finally found it... Whenever I enable AHCI the problem starts.

If I leave AHCI off then it says "Loading Operating System" then "Boot from CD/DVD:" and then starts to load windows straight away. No 20+ seconds delay.

So, the question then ... Is AHCI really worth it? This problem aside, am I really getting any performance advantage, or any monitoring/diagnostic or functionality advantage by having AHCI enabled?

IIRC, the two main features of AHCI are hot plugging and NCQ. I have no need of Hot-plugging, but NCQ seems to make sense, especially since I often run multiple applications which perform simultaneous read/writes on the HDD. Such as media encoding, downloading, burning images and using word/excel all at the same time.

NCQ is also stated to reduce noise and power consumption. If this is true, and considering the loads I place on the HDD, is it advisable to keep AHCI enabled and live with the extra 20+ seconds boot time?

thoughts anyone?

Thanks
Tanya
The average computer user would not perceive any performance difference between Legacy IDE mode and AHCI mode.

However my personal opinion is that if you have a modern SATA hard disk why would you not want to run it at it's full potential? There is no good reason why your computer (nice rig by BTW) should not be able to run the disks in AHCI mode, and running in ancient IDE mode is just geek-wrong!

But here is what occurred to me: If you are going to run your computer in AHCI mode it is important to make that BIOS setting change BEFORE you install W7. If you did not that may explain the symptoms.

While clean installing W7 in AHCI mode is best, you can try and change over afterwards. See here: AHCI : Enable in Windows 7 / Vista


My System SpecsSystem Spec
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15 Aug 2011   #12
TanyaC

Linux Mint 17 Cinnamon | Win 7 Ult x64
 
 

Quote   Quote: Originally Posted by Sub Styler View Post
The problem may be enabling AHCI for your CD/DVD Drive which almost never support AHCI and then having your system try to boot from that first. If your BIOS permits it I would have AHCI enabled for hard disks and disabled for optical disks. If your OS is installed you may change the boot device priority to hard disk first. Then even if AHCI is enabled for you optical drive it shouldn't affect booting as your bios doesnt check the optical disk and just goes straight for the hard disk. although this still may cause issues when using the optical drive within the OS environment.
Damn it! You're right! Changing the first boot device to HDD got rid of the delay. What is interesting, I've had CD as first boot device since the day BIOSs supported boot sequences. A long time. And it has never caused this problem, only on the Gigabyte 6-series boards. It uses an Award BIOS.

Does anyone else have an Award BIOS that will do this if you boot from CD first.

I thought for a few seconds I might have a workaround. I have two sata controllers. I move the CD drives to the GSATA controller, run them in IDE mode and leave the harddisk in AHCI mode.

Problem is I have three optical drives, and the GSATA controller only support two devices, and it appears I cannot boot from the GSATA controller.

Well, fortunately, I don't need to boot from cd very often.
My System SpecsSystem Spec
15 Aug 2011   #13
TanyaC

Linux Mint 17 Cinnamon | Win 7 Ult x64
 
 

Quote   Quote: Originally Posted by TVeblen View Post
But here is what occurred to me: If you are going to run your computer in AHCI mode it is important to make that BIOS setting change BEFORE you install W7. If you did not that may explain the symptoms.

While clean installing W7 in AHCI mode is best, you can try and change over afterwards. See here: AHCI : Enable in Windows 7 / Vista
Yep, on top of that one. I always clean install.

thanks for the tip.

Tanya
My System SpecsSystem Spec
.

15 Aug 2011   #14
ignatzatsonic

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit
 
 

Quote   Quote: Originally Posted by Tanyam View Post

Does anyone else have an Award BIOS that will do this if you boot from CD first.
I do.

On a Gigabyte 6 series motherboard, no less.

My solution was to set the SSD as first in the boot sequence and to then use F12 when booting to bring up a screen to choose the DVD drive as the first boot device whenever necessary---without having to go into the BIOS and make a change. Like you, I rarely boot first from the DVD drive, but have historically always left it as first in the boot sequence as controlled in the BIOS. Can't do that anymore.
My System SpecsSystem Spec
15 Aug 2011   #15
TanyaC

Linux Mint 17 Cinnamon | Win 7 Ult x64
 
 

Quote   Quote: Originally Posted by ignatzatsonic View Post
Quote   Quote: Originally Posted by Tanyam View Post

Does anyone else have an Award BIOS that will do this if you boot from CD first.
I do.

On a Gigabyte 6 series motherboard, no less.

My solution was to set the SSD as first in the boot sequence and to then use F12 when booting to bring up a screen to choose the DVD drive as the first boot device whenever necessary---without having to go into the BIOS and make a change. Like you, I rarely boot first from the DVD drive, but have historically always left it as first in the boot sequence as controlled in the BIOS. Can't do that anymore.
Well, I think we'll have to consider this matter resolved. Looks like the Award BIOS has taken a backward step and that's just how it is. I will do the same as you, use F12 when I need to...

Now that's solved, it's time to look at SSD...
My System SpecsSystem Spec
11 Oct 2011   #16
ArchaicWarrior

Windows 7 x64 professional
 
 

THANK YOU!! Tanyam, I've been racking my brain on this problem for months but you did the hard yards and found the flaw!

I'll set my SSD as my 1st boot drive but will keep AHCI as my DF case has a hot-plug drive that I use for backing up. Hoping this change will work .. otherwise I'll just live with it.

Only on this forum and only Tanyam was able to give an answer to this verryy frustrating problem, thanks all.

======

Post script - Works beautifully!

AW.
My System SpecsSystem Spec
11 Oct 2011   #17
TanyaC

Linux Mint 17 Cinnamon | Win 7 Ult x64
 
 

Quote   Quote: Originally Posted by ArchaicWarrior View Post
THANK YOU!! Tanyam, I've been racking my brain on this problem for months but you did the hard yards and found the flaw!

I'll set my SSD as my 1st boot drive but will keep AHCI as my DF case has a hot-plug drive that I use for backing up. Hoping this change will work .. otherwise I'll just live with it.

Only on this forum and only Tanyam was able to give an answer to this verryy frustrating problem, thanks all.

======

Post script - Works beautifully!

AW.
Glad that it works for you. Always good to hear about happy endings.

I think credit is due to others as well for the solution, such as ignatzatsonic.

---
Always rep people that help you
My System SpecsSystem Spec
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 25 second boot up delay after post/AHCI screens




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