Hello everyone,
SSD harddisk alone hosting windows 10 works fine on this motherboard. But, connecting the 2nd non-SSD harddisk hosting Ubuntu (dual-boot) causes issues for BOTH  windows and Ubuntu installations:  random long freezes of about 10 seconds.
Removing the second non-SSD harddisk returns everything to normal and windows on the first SSD harddisk works smoothly again. 
Any idea why?
Thank you, in advance. 
Mori
My config: 
GA-MA770T-UD3P (rev 1.0), Phenom II X4 B50, RAM Corsair CM3X, HD1 SSD GEIL Zenith R3, HD2 WD Caviar Black, GPU NVIDIA GTX 750 Ti