The Front Face features the DVD Tray, Activity Light, Eject button, and Force Eject pin hole.
Back Face
The back face has a 15-Pin SATA Power Port and a 7-Pin SATA Data Port.
You will be daisy chaining the SATA Power Ports of all the 7 Drives to the Power Supply Unit using two modular SATA Power Cables.
Once all the Power Connections are in place, you will be connecting the SATA Data Ports of all the 7 Drives to the SATA Data Ports on the Motherboard using individual SATA Data Cables.
However, before you begin to connect the SATA Power Cables, and SATA Data Cables, it is good idea to physically mount all the Burners, Hard Disks, and SSDs inside the Case.