Dell D31M Owner's Manual page 63

Steps
1. Remove the screw (M2x3.5) that secures the M.2280 solid-state drive to the system board.
2. Slide and lift the M.2280 solid-state drive from the M.2 card slot on the system board.
Installing the M.2280 solid-state drive
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following images indicate the location of the M.2280 solid-state drive and provides a visual representation of the installation
procedure.
Removing and installing Customer Replaceable Units (CRUs) 63