Add Up to 36TB of StorageMounts up to three cost-effective SATA drives (sold separately) inside. You get to choose the drives that suit your needs. Mounts Up to Three SATA DrivesCustom bracket and cables support one 2.5-inch SATA SSD plus two 3.5-inch SATA drives, or three 2.5-inch SATA SSDs Rugged Construction, Sleek Design Constructed out of heavy-gauge aluminum, designed to make maximum use of the space and connections inside the Mac Pro. Item package quantity: 1.0