What does ready to start mean on Xbox one?

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Tags

1. #available
2. #existing
3. #games
4. #fully
5. #start
6. #faststart
7. #ready
8. #initial
9. #before
10. #downloaded
11. #level
12. #supplants
13. #separate
14. #allows
15. #feature
16. #typically
17. #gamers