Oh, this is every bit as bad as I feared. This is so so so so so so so so so bad.
You must NEVER do that. You need to understand how big these raw files are, and how you are doubling the burden on your hard drive when you do this. Essentially, you're halving the capacity of your computer, for absolutely no benefit.
And I can't stress this enough. ABSOLUTELY no benefit. Whatever benefit you think exists, I assure you it does not.
Have you ever read the phrase "non-destructive editing"?