Board Thread:Questions and Answers Forum/@comment-1.123.36.66-20141025073403/@comment-1539342-20141025125013

He can't. Destiny automatically installs itself to the HDD; if you don't complete the install, you can't play the game. Thankfully, it's a one-time install; you should only need to do it once. However, be warned that as Bungie releases new patches, you'll need to do more downloading. None of the patches will be anywhere near as big as the initial install, so it won't take anywhere near as long.