I just responded to your other post - which by the way says 800 megs of data, not gigs.
Here's what - if you have access to that data, and you don't have it backed up - do that NOW - I don't care how much data it is, you need to face the fact that it needs to be backed up - this is a case of back it up or risk losing it all, or, face major grief trying to recover it.
Once you have a backup - reformat - and a reformat is ALWAYS an option - it may not be convenient, it may not be what you want to do, but, given the disk configuration you are using, it's a very viable option and one that you should seriously consider.
One of the moderators was a little less than happy when, on a previous occassion, I suggested that when a disk fails in a JBOD configuration you could lose all the data, even the data on the remaining disk - so - you won't lose the data, you will however lose access to it, and regaining access will be very challenging.
Unless you expect to have a dataset exceeding the capacity of a single disk (1.5TB) - and if you do, then you really should not be using a consumer grade device - there is no other advantage to a JBOD configuration, and in my opinion it is just not worth the risk of losing access to the data.