AIC XE1-4ET00-07 RSC-4ET,​ 4U 24x 3.5" hot-swap bays,​ tool-less 3.5" and 2.5" HDD tray,​ 1200W CRPS redundant power supply,​ 2x 2.5" hot-swap OS,​ rail,​ 4U24 SAS 12G expander controller on backplane (35X