The Disk Drive Bays
The Aerocool RS-4 has four 5.25” external bays and six internal 3.5” bays. Only two of the four 5.25” bays come with tool-less installation mechanisms.
The six internal 3.5” bays are divided into two hard drive cages. The top one, which is red, is removable, allowing you to install longer video cards. Hard drives are installed using tool-less mechanisms based on rulers, i.e. you have to install one ruler at each side of the drive and then slide the drive into the bay you want to use.
The product comes with one 3.5”-to-2.5” adapter, allowing you to install a laptop hard drive or an SSD unit.