Three VelociRaptor WD5000HHTZ's: One is Slower than the Others

WD Internal Drives Desktop & Mobile Drives
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When I tested the WXB drive (not the slowpoke which is WX3) there was a slight click sound that was synced with the updating of the graph. I didn’t notice the same thing when I tested the other two drives. I don’t know if that’s important or not.