Wierd freezes while playing WoW with good pc

[signs]

Hello, about a month ago I built my new pc thinking it would enhance my gaming experience. But I have noticed wierd "freezes" or fps drops that usually lasts for about half a second but can last longer. I have pretty much 60 fps everywhere but this is starting to get really annoying..

My specs are:
Intel i7 950
Asus A6X58D-E
CORSAIR 6GB DDR3 XMS3 INTEL I7 9XX PC12800 1600MHZ CL9
ATI radeon sapphire hd4870 512MB
OCZ VERTEX 2 2.5" 60GB SSD SATA/300 MLC
HITACHI DESKSTAR 7K1000.C 250GB 7200RPM SATA/300 8MB
CORSAIR TX 750W ATX12V 2.2 / EPS12V
Windows 7 -64 bit

I'm not very good with problem solving but it seems like there could be some kind of interferance between the HDD's.

Please help me because it sucks spending a fortune and then get dissapointed :/

 

[rob_n86]

Which HDD is WoW installed on?

 

[signs]

The OCZ SSD, some other programs are acting up aswell. I'm out on thin ice here but I would say that its probably something with the HDD's.

EDIT: Seems like most programs are freezing or lagging a bit, on the Hitachi drive that is.