PowerEdge R7615 Supported Drives

Internal drive bay and hot-plug backplane:

Up to 32 x EDSFF E3.S Gen5 NVMe (SSD)  
Up to 24 x 2.5” HDD: SAS, SATA, Near-line SAS SSD: SAS, SATA 
Up to 12 x 3.5” HDD: SAS, SATA, Near-line SAS SSD: SAS, SATA 

Datasheet: R7615 spec sheet