36x (24 front + 12 rear) 3.5" hot-swap SAS/SATA drive bays Optional rear 2.5" removable HDD Redundant 1600W Titanium Level (1+1) power supplies with PMBus 7x low-profile expansion slots; 7x 8cm (middle) hot-swap 13.5Krpm cooling fans and adjustable air shroud E1C12: Single SAS3 (12Gbps) expander plus 12 x NVMe backplane(Front:8/ Rear:4) Mini SAS HD (SFF 8643) connectivity on backplane