Rear View of a Drive Enclosure
Figure: Rear View of a 2.5" NVMe Type Drive Enclosure

Figure: Rear View of a 2.5"/3.5" Type Drive Enclosure (When Only One I/O Module Is Installed)

Figure: Rear View of a 2.5"/3.5" Type Drive Enclosure (When Two I/O Modules are Installed)

I/O module (IOM#0, IOM#1)
(Refer to I/O Modules.)
Power supply unit (PSU#0, PSU#1)
(Refer to Power Supply Units.)