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]

So if I just put the one drive in there, do I just format it as NTFS? then if I add a 2nd drive in a few months I will be able to just use it as extra/increase storage and not as a mirror of the first without having to format the original again?

 

[Sayn]

Awesome. Thanks for your help.