We're excited to announce that we've fully migrated the Xbox Forums to their new home, here on the Microsoft Community forums!
As of today, going to forums.xbox.com will redirect you here to the Xbox area of the Community forums. We've moved all of your existing threads over so you can continue and start conversations with the new forums experience.
We sincerely appreciate the feedback you have provided over this transition and can't wait for you to check out the new Xbox Forums!
Go to the System Tab> Memory> Games and simply pick which Item you wish to Delete. As for Installing a new Xbox 360 HDD, simply remove the top cover and snap in place. Don't forget to replace the cover afterwards.
Just remember, a new Xbox 360 S must use a new S HDD. An "old fat" Xbox 350 must use an "old" HDD. The two are not compatible.