Did the trick.
Thanks Phinx!

Thanks Brink, Looks good, system started shows AHCI enabled in Samsung Magician.
Would you recommend enabling Samsung's RAPID mode for better performance?

So then I would leave the StartOverride key in iaStorV alone? The value is currently set to 3.

Interestingly when I checked my Lenovo P300 system at home which also has an 850 EVO SSD the...

Sorry to bug you with so many questions but I want to make sure I get it right this time.
In the screenshot for steps 3-5 in the tutorial the iaStorV key does not show the StartOverride key but in...

What should I do about the StartOverride key DWORD value in the iaStorV key ?

Thanks Brink
after adding the missing key and following the tutorial isit likely i'll meet with success?

105252 here's the screenshot of the registry window

Is there more than one way to skinthis cat? I also came across this post of the forum which seems simpler...good method?

One more question. Does the StartOveride key in iaStoreV need to be...

One more question. Does the StartOveride key in iaStoreV need to be changed to 0 also?

Not being well versed in registry editing, how does it get added?

Thanks

I attempted this today, unsuccesfully I'm afraid. I have a Samsung 850EVO SSD.
As I went through the registry changes I found that at step5 value was 0, at step 7/8-...