Zoltan I had a very similar experience as you yesterday, I installed a Samsung 840 evo SSD into the upper position and kept the original 1TB HDD in the same place, according to the guide. Then I encountered lots of weird issues trying to partition the SSD with disk utility. Not to mention its slow and sometimes the disk even unmount by itself. I spent many hours and figured out swapping the positions of the two drives might help, then it worked!!! I hope I read the comment here earlier.
POINT IS: Better to put the SSD in the lower position and move the original disk to upper position, you may or may not have issue following the guide, but apparently lots of people have run into performance or stability issues .
Anyway thanks for the great kit and the guide!
Sobald er das hat, wird er in der Lage sein, eine Grafik zu seiner im Laufe der Zeit erlangten Reputation zu sehen.
Hier ist eine Vorschau, wie die Grafik aussehen wird:
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