I do not know if anyone with this disk type (the whole exterior casing of the disk is black) had any problems but I have two of them and they both have the same problem. The disk seems to slow its spinning cycle, stop completely, the windows freeze for some seconds and then the HD starts spinning again making the same sound like you have just opened the PC! After HD spins up again, Windows unfreeze and behave normally. This happened for quite some time and often eventhough both disks have adequate cooling. The only way to completely solve the problem was to turn them upside down and screw them back to position. Has anyone faced this problem before? Is this partiqular batch of disks from Western Digital defective in anyway?