In the opposite of PCI slot, it is the where the HDD cage located. The HDD cage is able to hold up to 4 HDD and it is equipped with a red led 120mm fan. The red colour does match the theme of the red sensor power button. The is also 4 rubber at each side of the hdd cage to prevent the vibration of the HDD making noise. This time Cooler Master did a pretty good job like the previous cosmos 1000 in sound dampening.

If the HDD cage is install, the is still 7 of 5.25" bay are available for you rom or any 5.25" devices to install. The fit into location mechanism is very simple. Push the blue button to lock, and push another time to unlock. However, on the another side, there is no such mechanism. If you can live with side side locked, then it is easy. For myself, I will still put 2 screw on the other side to fit the 5.25" devices nicely.

The last part of that I am going through is the pre-cut routing holes. They has made some changes, the vertical holes becomes 3 instead of 2 on the cosmos 1000. They also move the horizontal hole and allign them together. The hole is very good in cable routing. Just becareful those those thick cable should route through the upper horizontal hole. This is because there is a metal bar on the side panel will cross between 2 horizontal hole. On my installation, I fit all nicely on the bottom hole, when want to close the panel to try power up, realize my 24-pin cable block the metal bar on the side panel. All nicely route cable have to be re-route, end up no mood by simple routing and a bit messy at the PSU area.
Conclusions:Overall, I still like this casing. This is still the best among those I am looking for. The case is suite both the air cooling and water cooling needs. No regret if you get this case. Below I list some pro and cons of the casing.
Pro:
1. A lot of space, easy for assembling
2. Very good air ventilation
3. Easy cleaning air filter
4. Easy Mounting 5.25 device
5. Cool red sensor power button
6. Beautiful and cool design
7. Full feature I/O port
8. Easy cable routing
Cons:
1. Side panel fan has problem with high tower cooler
2. Sharp edges at some part
3. Some useless metal bar block cable routing
4. Even provided extension, some cable is still not long enough.
5. Right panel space are limited and need well plan cable routing or else will end up unable to close the side panel.
Specially thanks to those helps in the review and providing me opinion for cable routing:1. Zhane
2. Verticalar
3. hiphop