Installing Win7 on a HDD setup for IDE mode in AHCI mode

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Installing Win7 on a HDD setup for IDE mode in AHCI mode

Postby videobruce » Mon Oct 07, 2013 4:11 pm

I'm not sure where to put this, but here it is.

Using a already formatted & partitioned HDD from a older non GPT ready (if you will) MB, I want to install Win7 64 bit using AHCI. The current O/S on that active partition is XP which I want to replace.
The other partitions (two) have data on them that I don't want to loose. (I do have it backed up).

What happens to the drive when I install Win7 in AHCI mode to the other non active partitions?
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Postby videobruce » Mon Oct 07, 2013 4:17 pm

A 2nd question; with a SSD drive that I have installed Win7 on (fresh install), for kicks & giggles, I switched back to IDE mode and booted back into Windows. To mu partial surprise, there was no difference unlike the other way around where you get greeted with a BSOD.

With that SSD, if I leave the SATA mode to IDE, what is the disadvantage?
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Postby evasive » Mon Oct 07, 2013 9:46 pm

after set for IDE and booted into windows, run this:
http://support.microsoft.com/kb/922976/en

Set it to AHCI mode and boot into windows.

AHCI is a more modern protocol with extra resilience and performance compared to IDE. You use IDE mode for older operating systems compatability.
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Postby videobruce » Tue Oct 08, 2013 2:28 am

I wasn't planning on leaving it to IDE, I was just wondering where I would see a difference since I wasn't sure it would work going from AHCI to IDE. How about GPT vs MBR when Windows is installed? Wouldn't that affect the other non active partitions?

Lastly, how about "compatibility mode. Why would I want to turn it off?
When not in use, turn off the juice.
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Postby evasive » Tue Oct 08, 2013 2:57 am

my last post is about compatibility mode/setting your SATA to IDE instead of AHCI.

Since that disk is <2TB you can leave it as MBR, no need for GPT. Oh it would kill everything on the disk if you wanted to convert anyway:
http://www.sevenforums.com/tutorials/26 ... -disk.html
Converting the disk requires that all partitions and volumes are deleted on the disk.
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