I have a WDC WD1001FALS (Caviar Black 1TB). The problem is that I cant use the AHCI mode as I'm supposed to. The computer frequently locks for about 30-60 seconds whatever I'm doing and some games gets strange graphical issues. When I turn AHCI off then all is stable, but lately it's not stable at Native IDE mode either as I'm getting bluescreen for IRQ issues. Last time I got bluescreen I did a quick restart and computer locked in bios, I had turn the whole computer off before it was alright again. I ordered it from Komplett.se, maybe I should see if I can get a new one, but does anyone have a clue what could be the problem? Could it just be the jumper set wrong, some cables, a setting or something...? I'm not very good at hardware so I have no idea. Oh, yes, I had AHCI enabled in bios during install and the harddrive is the only thing I changed when this problem came.