I am active user of external HDDs and I like Storm Stryker (I curently don't have one). But honestly I don't see from photos that I can put external 2.5" HDD on top of the case. I see that there is place from the right and from the left side from handle, but it seems that it is very small for any HDD. I also see that there is some space under Handle (near Top 200mm Fan), but it is again not clear will HDD fit there or not.
I hope that some of you use external HDD too, where do you put them, on case or you just use USB-USB cables, hubs etc because it is impossible to fit HDD on top of Stryker/Trooper.