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  1. #1

    Member Since
    Sep 02, 2012
    Question Mac not reading USB during boot (while holding alt/option)
    So I need my mac to be able to read USBs when I boot my mac while holding alt/option. On my older mac, this does not happen, and I can not see the USB, while on my newer mac I can see the usb during alt/option boot. They are both running mountain lion, so how can I get my older mac to show the USb during boot

  2. #2

    mrplow's Avatar
    Member Since
    Oct 01, 2007
    Mac Mini i5 (2014 High Sierra), iPhone X, Apple Watch, iPad Pro 12.9, AppleTV (4)
    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.

    Please use the reputation system if you think you've been helped - bottom left of this post

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