Fujitsu DYNAMO 640 AI Guide D'utilisation page 21

2) Attach to the system chassis
DynaMO 640AI can be mounted either horizontally or vertically. Never
install your DynaMO 640AI upside down.
(a) Mount the drive in the 5.25 inch bay with the longer (10 mm)
screws as shown.
(b) Mount the drive in the 3.5 inch bay with the shorter (4 mm) screws
as shown.
.
1.15