I recently changed my motherboard and CPU (I also installed a new drive) and was pleasantly surprised to see that my old drive actually worked with them. I was told to expect that at best, I would only be able to use the data on the old drive but that nothing would run on it. But it seems that I can use the old drive just as before (!) So now my question is this, if I format and partition the new drive and begin to install OS and programs on it (basically migrate to it)...will I still be able to use my old drive? Ideally, I'd like to migrate to the new drive (installing OS, programs and copying files to it from the old drive) and then using the old drive as back up...but... only when I'm ready. Can I continue to use both at the same time, until then? Or will I be forced to only run programs from the new one once I boot from it at startup (right now the system defaults to the old drive since the new one is blank, blank)? Thanks.