I see. Yes, i'm probably misusing the term. I figured JBOD meant exactly what I thought, but it's not.
No, it might just be me.
As I said, generally
JBOD has implied what is really meant as SPAN when people talked about it. But JBOD really means what you have stated, Just a Bunch Of Drives - each individually addressable.
So your use is correct, however specifying JBOD still implies no data redundancy.
What's the difference between what I'm describing and Raid-1?
With RAID-1, one HDD is mirrored to another - they both contain exactly the same data, ergo they, (AFAIK), have to be the same capacity. It's also taken care of by the controller, no user interaction, (apart from initial setup), required unless one HDD dies.
File syncing requires that the user run additional software, (and makes sure it's running), and action any errors, eg. files locked, permissions, etc, however the HDDs can be different capacities or the same HDD but different partition.
Incidentally, following on from worstje and JJ above, if you were going to try RAID-1, (even if only on a pair of your HDDs), I'd suggest using two different manufacturers, eg. WD 2TB and a Samsung 2TB, you'd be unlikely to end up with two HDD from the same batch. Also, it would probably be better to use Enterprise class HDDs instead of Desktop class.