[HHD] Strange lag

Hello,

I tried to get some responses from Google, but the only thing I found is people who don't know how to clean up a PC, so here I am.

I'm having a strange bug with my HHD. For some reason, it suddenly go to 100% processing (in the Task Manager) and my PC just start to lag really bad (softwares crash and sometime the PC itself). I don't do anything special when it reach 100%, so I can't tell what's making this.

I don't think its software related 'cause after having this problem a couple of time, I reinstalled my PC with Windows 8 and got the same problem, but less frequently. For now, I'm trying to defrag it and pass HHD tests.

Windows 8 Pro
Intel Core i5-2320 @ 3.00 GHz (4 CPUs)
~10GB RAM
The HHD is a 2TB Western Digital (WDC WD20EARX-22PASB0)


Thanks

Gabriel

(Disclaimer : I'm not a native english, so maybe my text if full of wierd stuff, sorry if it's the case)