Accommodates 1x 3.5" SATA HDD and 2x SATA HDD/SSD (up to 9.5 mm drive height) ^^ Installs into any standard external 5.25" device bay ^^ Retractable dust cover for 3.5" slot to reduce the dust buildups in the system ^^ Supports SATA 6Gbp/s transfer speed ^^ Tool-less, screw-less, and door-less drive installation