Asus FX504GM EN102T E-Manual page 83

E. Place the new HDD with its PCB (Printed Circuit Board) facing the
HDD bay. Ensure that the port connectors of your HDD are not
obstructed by any part of the HDD bay.
F. Reattach and secure the HDD with the screws you removed
earlier.
Notebook PC E-Manual
new HDD
HDD bay
83