PowerEdge R710 Supported Drives

Internal drive bay and hot-plug backplane:
Up to 8 x 2.5” HDD: SAS, SATA, Near-line SAS SSD: SAS, SATA
Up to 6 x 3.5” HDD: SAS, SATA, Near-line SAS SSD: SAS, SATA

Optional flex bay narrows up to 4 x 3.5" drives 

Datasheet: R710 spec sheet