You should post a more friendly title.
The core 1000 has its hard drives mounted sideways on a plate that is held in with 3 screw(2 top and one under the case). The hard drives mount to this with screws from the bottom side.
Red = 3 screw locations that hold the plate on
Blue = Hard drive screw locations(for 3.5 inch drives)
Green = Not to scale location of 3.5 inch drives when installed.