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Once the four screws are removed, you can easily remove the top by just lifting it up and out of the way. With the case top removed, to install drives, you just slide them into the tray and connect each side to the tray with two screws (Figure 4).

Figure 4: CS407 with case top removed. Here you can see the sets of screws that secure the drives to the drive trays.

Synology has placed a well-illustrated installation guide that shows how to install and cable the drives right on top of the drive cage. In addition, the PCB is labeled with hard drive designations that correspond to the installation illustration that's on the top of the drive cage (Figure 5). As you might guess, the drives are not hot swappable.

Figure 5: Cable locations are clearly marked. A cabling diagram is affixed to the top of the drive cage.