Adding a 2nd HDD to a NAS enclosure at a later date. Increase storage?

[Sayn]

Hey, does anyone know if its possible to add a 2nd HDD at a later date to a NAS enclosure so it is used to increase the storage.
I have a Zyxel NAS-320 arriving soon (supports Raid0, Raid1 and JBOD) and I have a Samsung 2TB F4 to put in it. Would I be able to add a 2nd 2TB drive in a few months and increase the storage to 4TB overall? or would this have to be done at the beginning?
Thanks

 

[Sayn]

Appologies. Didnt the storage section used to be called Harddrives? I quickly scanned through and because 'i didnt see that section posted here, only to notice a Storage section when I looked again