I bought a WD My Passport cheap from Amazon and pulled it apart to get to the WD2500BEVS (250gb) drive. I popped it in my macbook, which was easy enough, but today I had to go back to the original hard drive. The vibration from the replacement drive at first did not feel too bad but after a short while it started to bother me and soon after I had to walk away from the machine. I still need to upgrade the HD. Does the WD3200BEVT (320GB) have the same vibration problem?