I'm trying to revert this back to the Standard SATA AHCI Controller again, but I am getting this message.

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Yes.
Thank you, muchomurka.

It initially wasn't working with the standard controller, but for some reason, it's working now.
I see that it is listed twice in the drop down list, so maybe that...

Hi muchomurka.
So sorry to take so long. I've been away.
Here is the screenshot.

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Hard Disk Sentinel was giving me warnings that TRIM was disabled every time I plugged my SSD into that controller, and Samsung Magician couldn't even see the drive.

I tried using a command to...

Hi edo101.
Unfortunately, that doesn't work.
I am starting to think that the controller doesn't support it.

Thanks muchomurka, but I have tried using the Standard SATA AHCI Controller driver.

I have just started using this controller, but TRIM is disabled using it.
I am using v1.2.0.1047 (30/04/2015) WHQL Windows 10.