Normally, it is not possible for you to store Netflix on USB, as all Netflix videos are encrypted by DRM, meaning that you can only stream them with the Netflix app. Therefore, to download Netflix to USB for playing on Xbox, a third-party program is required to get rid of DRM first.
MovPilot Netflix Video Downloader provides a DRM-removing function, allowing you to unlock DRM and convert Netflix videos to H.264 MP4 files (which are compatible with Xbox devices) at HD 1080p definition. Through this method, you are possible to play Netflix on Xbox even without Internet connectivity, leading to more stable performance for enjoying Netflix playback.