Page 11 - MGE/XG - Viper 2 (3)
Looking at the upper inside we can see that the Viper 2 can hold 4 optical drivers slash 5.25" devices. They all can be secured with both screws or the provided plastic clip to mount them tool-less.
When we move downward we see that the case can handle a lot of 3.5" devices also. You could mount six HD's in there if you don't insert any floppy drives.
And as stated .. this is a tool free system. The four internal HD bays can use either the tool free system or simply use regular screws if you want to. Notice the small shelves to help hold the drive in place while mounting.
The front intake comes with an 80mm fan, but can provide accommodation for a 92 or 120mm versions as well.