OK so looks like I'm an ignorant idjit. Still researching this Raid concept, but it looks like I'd need identically sized drives in order to run any Raid format. Is this correct?
Eg : if you have a 400 and a 320 , you will only get 320 as storage. And the 80 gb is lost. So , that way, yes, you need to have identically sized drives.
This is my understanding of it.