PLANET NVR-1620 - Manual (Page 8)

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8. Make sure the screw holes on the HDD are aligned with the ones on the tray.
9. Secure the HDD with the screws provided in the accessory box with a Philips
screw driver. There are four for each HDD; two for each side of the tray.
10. Install the top HDD by attaching it to the corresponding SATA cable first.