The Disk Drive Bays
As mentioned this case has four external 5.25” bays and seven internal 3.5” bays. One of these 3.5” bays can be used for installing a floppy disk drive, so the maximum number of hard disk drives you can have is six or seven, if you don’t have a floppy disk drive. The front 180 mm fan is located in front of the hard disk drive bays, cooling them down.
As you can see in Figure 12 this case uses screwless mechanisms for fastening disk drives to the case.