To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
The trays are poorly designed using the bottom of the hard drive to mount them. The screws that come with it have to be perfectly aligned to go in. The non-rack series is a significantly better product at a cheaper cost. Do not buy the rack versions.