PowerEdge R730xd Supported Drives

Internal drive bay and hot-plug backplane:
Up to 24 x 2.5” + 2 x 2.5" HDD: SAS, SATA, Near-line SAS SSD: SAS, SATA, Up to 4 NVMe PCIe
Up to 16 x 3.5” + 2 x 2.5” HDD: SAS, SATA, Near-line SAS SSD: SAS, SATA 

Datasheet: R730xd spec sheet