Observint DVR9004N - Page 96

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7. While holding the HDD in place in the chassis, carefully turn over the chassis with the HDD, then install the four HDD mounting
screws to anchor the HDD to the chassis. Tighten the screws until snug.
HDD
mounting
screws
8. Turn the chassis over (top up). Check the SATA data and power cable connectors at both ends to ensure they are fully seated.
APPENDIX C: HDD INSTALLATION