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