Zyxel NSA-2401 Guide De Démarrage Rapide page 6

3. Place the disk tray on a flat surface with the panel facing up. Place a hard
disk with the screw holes facing up on the same surface and slide it into
the disk tray. Secure it with the screws as shown.
4. Push the top of the tray back into NSA disk bay 1 until it snaps into place
and push the latch up as shown.
5. Repeat steps 1 to 3 for other hard drives that you may have.
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ENGLISH