Further down on the floor of the chassis resides a single 3.5 HDD cage. This cage is completely tool-less and the drive simply slots into the cage and clicks into place with the latch at the side. SilverStone have also included a fabric strap which helps to pull the HDD back out of the cage once its installed. Sitting on the roof of this cage is a CPU cooler support mechanism which helps to relieve heavy CPU coolers from bending etc.
There is also another cage over at the front of the case which features a series of five options for 3.5 drives in the upper section and again another slot for a 3.5 drive via the tool-less method.
In both the lower cages within Raven 4 two 2.5 drive can be installed there are mounting holes for this.

Tool-less installation for HDD

More HDD storage
Finally at the front and towards the top of the case is the optical drive bay which can house two 5.25 drives standard screws are required for installation, there are no tool-free design mechanisms.

The optical drive bay