Dell XPS 15 Service Manual page 32

Figure 11. Removing the solid-state drive assembly
1 screw
3 solid-state drive slot
3 Turn the solid-state drive assembly over, and then remove the screw (M2x2) that secures the solid-state drive to the solid-state drive
bracket.
Figure 12. Removing the solid-state drive bracket
1 solid-state drive bracket
3 solid-state drive
4 Lift the solid-state drive off the solid-state drive bracket.
32 Removing the solid-state drive (half-length)
2 solid-state drive assembly
4 system board
2 screw