Looks at at first but when it comes to hard drives I have become some what an expert and mounting as he have done is a no no especially knowing that most drive manufacturers have skimped on quality. To be more specific the spindle motor. When mounted horizontally all the weight of the platters is evenly distributed on the bearings producing even wear that is predictable. How ever mounting as he have done shortens the life of drive spindle by mounting them vertically ware the weight is unevenly distributed on the bearings producing wear that causes bearings on one side to prematurely fail sooner than they would have normally and also it produces more noise as they age. Second it is no surprise why he/she needed all those fans as the cabinet isn't absorbing and dissipating the heat from the drives as a normal cabinet would.