I have external enclosures, good Welland Sun Brights.
With one hdd I did what you suggest except that I kept a NTFS partition for the data that was already on it.
(so I wouldn't erase it, its 37GB so I didn't exactly want to put it on DVDs or even USB thumb drives while I set the disc up).
Now neither WIN7 nor XP will recognize it at all.
With the other disc; being afraid that I had done something wrong with the first, I haven't done anything yet.
That also has some data that I would like to keep (34GB) but seeing what happened with the 1st disc I am wary of ending up in the same position.
Maybe I do have to move the data off it to another storage of some sort while I do it?????
And I'm still wondering how to get into the first unrecognized disc?
OK, I get I'll have to move everything off the disc but first I need to find a way to get it recognized, that is; when I put it in an enclosure and hook it up to a computer the computer can't see it, doesn't recognize it at all. I can't move the data until the disc can be seen.