Enhanced Security HDD Option Type M10 (D792-09)
SM 2-69 D255/D256/M281/M282
15. Remove the right lower cover [A] by rotating it in the direction of the arrow.
Be careful not to damage the hooks on the inside of the right lower cover when you
remove or install the right lower cover.
Do not remove the screw [A] when removing the right lower cover [B].