IMHO, it's kind of nice to keep the original drive handy in case you start having problems. If your machine starts acting up, you can use the original drive to help pinpoint the cause of the problem. If you stick the old drive back in and everything works fine, you know the problem must be with the new drive.
Frankly, I think you can tell from his forum that hundreds (if not thousands) of upgrades have occured, and you'll likely never need the original drive. Use the new drive for a few weeks if you're scared. No problems? Go ahead and use the original drive elsewhere.
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