Ricoh M281 Series Service Manual page 119

26. Install the HDD with the bracket [A] on the controller box [B] with the tapping screws.
(hook×2)
27. Reassemble the machine.

When reattaching the controller board [A] with the BiCU [B] on the controller box [C],
connect the two cables of the HDD to the controller board [A].

When reattaching the controller box [A], make sure to secure the harness and flat
cable to the harness guides, as shown below.
SM
Enhanced Security HDD Option Type M10 (D792-09)
2-91 D255/D256/M281/M282