An enclosure for a rack mount storage unit, comprising: a bottom plate defining a horizontal plane; a pair of side plates having a first plate and a second side plate, the first and second side plates are parallel and define a vertical plane; a pair of end plates having a first end plate and a second end plate, the bottom plate, the pair of side plates and the pair of end plates being integrally connected; a pair of circuit boards having a first circuit board and a second circuit board; a first row of one or more stacks of hard drives extending perpendicularly between the pair of end plates and connected to the first circuit board extending perpendicularly upward from the bottom plate and parallel to the first side plate, each hard disk drive in the first row of one or more stacks of hard disk drives are co-planar with the bottom plate defining the first horizontal plane; and a second row of one or more stacks of hard drives extending perpendicularly between the pair of end plates and connected to the second circuit board extending perpendicularly upward from the bottom plate and parallel to the second side plate, each hard disk drive in the second row of one or more stacks of hard disk drives in the second row co-planar with the bottom plate defining the first horizontal plane; and wherein each of the hard drives in the first row of one or more stacks of hard drives is located between the first end plate and the first side plate such that the first end plate is perpendicular to the first row of one or more stacks of hard drives and parallel to and in the same horizontal plane of the first side plate allowing the each of the hard drives in the first row of one or more stacks of hard drives to be mounted from the side of the enclosure; wherein each of the hard drives in the second row of one or more stacks of hard drives is located between the first end plate and the second side plate such that the second end plate is perpendicular to the second row of one or more stacks of hard drives and parallel to and in the same horizontal plane of the second side plate allowing the each of the hard drives in the second row of one or more stacks of hard drives to be mounted from the side of the enclosure; wherein the first circuit board is located between the first end plate and the first side plate; wherein the second circuit board is located between the first end plate and the second side plate; and wherein the first circuit board and the second circuit board are located between the first row and the second row of one or more stacks of hard drives. a bottom plate defining a horizontal plane; a pair of side plates having a first plate and a second side plate, the first and second side plates are parallel and define a vertical plane; a pair of end plates having a first end plate and a second end plate, the bottom plate, the pair of side plates and the pair of end plates being integrally connected; a pair of circuit boards having a first circuit board and a second circuit board; a first row of one or more stacks of hard drives extending perpendicularly between the pair of end plates and connected to the first circuit board extending perpendicularly upward from the bottom plate and parallel to the first side plate, each hard disk drive in the first row of one or more stacks of hard disk drives are co-planar with the bottom plate defining the first horizontal plane; and a second row of one or more stacks of hard drives extending perpendicularly between the pair of end plates and connected to the second circuit board extending perpendicularly upward from the bottom plate and parallel to the second side plate, each hard disk drive in the second row of one or more stacks of hard disk drives in the second row co-planar with the bottom plate defining the first horizontal plane; and wherein each of the hard drives in the first row of one or more stacks of hard drives is located between the first end plate and the first side plate such that the first end plate is perpendicular to the first row of one or more stacks of hard drives and parallel to and in the same horizontal plane of the first side plate allowing the each of the hard drives in the first row of one or more stacks of hard drives to be mounted from the side of the enclosure; wherein each of the hard drives in the second row of one or more stacks of hard drives is located between the first end plate and the second side plate such that the second end plate is perpendicular to the second row of one or more stacks of hard drives and parallel to and in the same horizontal plane of the second side plate allowing the each of the hard drives in the second row of one or more stacks of hard drives to be mounted from the side of the enclosure; wherein the first circuit board is located between the first end plate and the first side plate; wherein the second circuit board is located between the first end plate and the second side plate; and wherein the first circuit board and the second circuit board are located between the first row and the second row of one or more stacks of hard drives.