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Windows 7: SSD question

11 Jun 2016   #1

Microsoft Windows 7 Home Premium 64bit
SSD question

I just installed a SSD (Samsung 850 EVO) on my motherboard and my friends are telling me to switch to AHCI mode to get more performance in my SSD, Will this really help? My bios is running on it's default settings atm.

My System SpecsSystem Spec
11 Jun 2016   #2
Layback Bear

Windows 10 Pro. 64/ version 1709 Windows 7 Pro/64

I would also suggest AHCI.
My System SpecsSystem Spec
11 Jun 2016   #3

Win-7-Pro64bit 7-H-Prem-64bit

Kind of scary it wasn't already as default :/
My System SpecsSystem Spec

11 Jun 2016   #4

Microsoft Windows 7 Home Premium 64bit

I had only a hard drive before, maybe it's the reason why isn't it at default?
My System SpecsSystem Spec
11 Jun 2016   #5

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit

It's a quick switch to move to AHCI, but if you didn't know you weren't using AHCI, it's unlikely you'd ever complain about poor performance.
My System SpecsSystem Spec
11 Jun 2016   #6

Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64 +Linux_VMs +Chromium_VM

Read the tutorial below if you haven't already, so you know what you have to do to change from IDE to ACHI.

To know for sure if it makes a difference for you, run some utilities such as Samsung Magician and other disk performance programs, now with IDE, and save the results.
Then run these programs after changing to AHCI and compare the results.

Personally, I would switch to AHCI, but make sure you have a backup/recovery plan before making any changes in case you run into problems.

Here is the tutorial:
AHCI : Enable in Windows 7 / Vista
My System SpecsSystem Spec
11 Jun 2016   #7

Microsoft Windows 7 Home Premium 64bit

When ever I boot up my system after the Gigabyte bootscreen there's this message that displays thisIt's in AHCI mode)
Serial ATA AHCI BIOS, Version iSrc 1.Z0E
Copyright Intel Corp
**This version supports only Hard Disk and CDROM drives*
Controller Bus#00, Device#1F, Function#02: 06 Ports, 03 Devices
Port-00: No device detected
Port-01: Hard Disk, Samsung SSD 850 EVO 120 GB
Port-02: No device detected
Port-04: No device detected
Port-05: Hard Disk, ST31000524AS
AHCI BIOS installed

This doesn't happen when my BIOS isn't in AHCI mode.
My System SpecsSystem Spec
11 Jun 2016   #8

Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64 +Linux_VMs +Chromium_VM

Did you read the tutorial i linked in Post#6 ?

That tutorial has instructions for what needs to be changed in Windows before making the BIOS change and restarting Windows.
My System SpecsSystem Spec
11 Jun 2016   #9

Microsoft Windows 7 Home Premium 64bit

I forgot to mention, I already changed it to AHCI I followed a guy from youtube on how to do it. It included the reg changes but not the iaStorV one. What should I do now?
My System SpecsSystem Spec
11 Jun 2016   #10

Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64 +Linux_VMs +Chromium_VM

To be sure i understand correctly,

Now you can't start Windows if the BIOS set to IDE or AHCI, neither setting works now for the new SSD.
You need to make one registry change to the iaStorV key to use AHCI.

You could try booting the PC with a W7 install disc or System Repair disc.
From there run Command Prompt, and manually edit the registry using the reg command.
Here's a couple of links that might help with this:
How To Delete And Add Registry Keys From The Command Line - gHacks Tech News
I've never done this before.

You don't have a backup such as a System Image backup from before making the registry changes, right ?

Did you transfer the OS from the old HD to the new SSD using cloning or imaging, or did you do a Clean Install on the SSD ?

If you can't manually fix the registry running a command prompt, you might need to redo the transfer or Clean Install to fix this.
My System SpecsSystem Spec

 SSD question

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