Fix SSD Slow Write/Read Speed – Step By Step

So, you bought an SSD drive, installed Windows on it – and the SSD’s writing/reading speed is not so great? One of the most common reasons for that is a wrong configuration – not enabling the AHCI mode. Enabling it will improve the performance of your SSD, and sometimes the change can be significant. If you bought one of Samsung’s SSDs – you should install Samsung Magician. It will allow you to optimize your SSD and benchmark it as well. Also, you can use this software to see if your AHCI is enabled or not.

It’s recommended to enable the AHCI mode before installing the operating system. But, if you didn’t do it – you can still enable AHCI. Here is a guide:

The reader takes full responsibility for any damage that may occur to their PC or hardware by following the guide.

1. Start –>run regedit


2. Open HKEY_LOCAL_MACHINE –>SYSTEM–>CurrentControlset–>Services –>msahci

3. In the right panel, find the “start” registry. Left click it and choose Modify.

4. Enter the number 0 in the data field –> click ok.


5. Reboot your computer –> enter BIOS mode (most of the times by pressing the delete key rapidly while booting, until the BIOS menu shows).

6. Select “Integrated Peripherals” –> Select OnChip PATA/SATA Devices. Change SATA Mode to AHCI from IDE.

7. Save (by pressing F10). Let Windows start, it will install few drivers. Then, restart your computer.

8. Enjoy ! Benchmark your SSD, you will defiantly see a great improvement.


If you followed this guide and it worked – please share it 🙂




  1. Yogev May 24, 2015 Reply
  2. Michael JO. February 11, 2016 Reply

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