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Apple Computing Products:
macOS - Operating System
Mac not reading USB during boot (while holding alt/option)
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<blockquote data-quote="mrplow" data-source="post: 1525338" data-attributes="member: 38928"><p>How old is your older Mac? Which model?</p><p></p><p>Some older hardware just doesn't have the required built in support for booting from a USB device.</p></blockquote><p></p>
[QUOTE="mrplow, post: 1525338, member: 38928"] How old is your older Mac? Which model? Some older hardware just doesn't have the required built in support for booting from a USB device. [/QUOTE]
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Apple Computing Products:
macOS - Operating System
Mac not reading USB during boot (while holding alt/option)
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