AIC RSC-4BT-35X - 4U 36x 3.5" hot-swap bays, tool-less 3.5" and 2.5" HDD tray, 1200W CRPS redundant power supply, 2x 7mm 2.5" hot-swap OS, low profile rear panel, rail, front 4U24 SAS 12G expander controller on backplane (35X series) + rear 2U12 SAS 12G