This hard drive caddy works with the latest 14th Generation and XC Series appliances. Supported Hot-Plug 2.5-inch Drive Bay models R340, R440, R640, R740, R740xd, R840, R940, R940xa, R6415, R6515, R6525, R7415, R7425, R7515, R7525; XC Series appliances XC640-4, XC640-4i, XC740xd-24, XC940-24, XC6420-6 and C6420, C6520 Enclosure. NOT compatible when your server has a 3.5-inch drive bay