Choose the USB stickand press <b>Enter</b>. The USB stick appears as an external hard diskand might be labeled <b>EFI Boot</b>or<b>Windows</b> like in the following screenshot:
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[[!img install/inc/screenshots/mac_startup_usb.png link="no" class="screenshot" alt="Screen with the logo of an internal hard disk labeled 'Macintosh HD' and an external hard disk labelled 'Windows' (selected)"]]
[[!img install/inc/screenshots/mac_startup_usb.png link="no" class="screenshot" alt="Screen with the logo of an internal hard disk labeled 'Macintosh HD' and an external hard disk labelled 'Windows' (selected)"]]