Windows 10: Should I use AHCI or SHR for best performance on SSD?

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submitted by /u/lynet_101
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How to Enable AHCI for SSD in Windows 10.

Original title: AHCI for SSD

I've installed a Samsung 850 Pro 512 gig SSD. The Samsung Magician is telling me " AHCI is disabled for one or more connected SSDs. System must boot in AHCI mode for best performance". How do I enable AHCI in Windows 10 Pro? Thanks in advance.

 

How to check on windows 10 if the ssd is using AHCI ?

I am running Windows 10 on a MacBook Pro early 2011 and would like to ask how to check if the SSD is using AHCI?

The SSD software, Samsung Magic, is saying:

…and…

In the device manager, there is:

…and also…

 

How to Enable AHCI for SSD in Windows 10.

I had this issue, but couldn't solve it with the suggested Registry changes, instead this worked and seems much simpler:

Start windows 10

Select Safe Mode Boot in msconfig

Reboot go into BIOS

Change Setting to AHCI

Continue into Windows (Safe Mode)

Let Windows do its magic

Uncheck Safe Mode in msconfig

Reboot as normal

I was struggling to get a Samsung SSD 850 Evo 250GB running in AHCI mode on an ASUS M4A88TD-V EVO/USB Motherboard, it would only run in IDE mode.

Making the above changes improved the performance reported by Samsung Magician from:

IDE : Sequential (MB/s) Read 263 Write 358 Random (IOPS) Read 7859 Write 17012

to:

AHCI: Sequential (MB/s) Read 516 Write 476 Random (IOPS) Read 50,188 Write 24,240

And improved the boot time significantly, so worth the effort.

Thanks,