Adding a second drive in a 2 bay enclosure?

[mynewromantica]

I am considering buying a new 2-bay external enclosure for back up purposes, but only using 1 bay in it. When I have the need or money, I plan on buying another drive to put in there. The question I have is, when I do that will I have to reformat the first drive to be able to see both of them as one?

[Kirbdog]

Not usually, but it will will depend on how it will be configured. Some configurations require a both drives to be formatted together. If you want both drives to appear as one big drive they would both need to be formatted together. Check the manual of the enclosure you are interested in online before you commit.

[Badger^2]

Are you saving money?

Dual bay cases have fans = lots of noise.

I prefer single bay cases myself.