Synology NAS FS3410 Hardware Installation Manual page 13

3 Insert the loaded drive tray into the empty drive bay.
Note:
Make sure that the drive tray is completely inserted. Otherwise, the drive might not function properly.
4 Push the handle inward to secure the drive tray.
5 Push the switch on the drive tray handle to the bottom to lock the drive tray.
6 Repeat the steps above to install the other drives you have prepared.
7 Drives are numbered as shown below.
Note: If you plan to create a RAID volume, we recommend installing drives of identical size to make the best
use of drive capacity.
13 Chapter 2: Hardware Setup