Guest macguru9999 Posted May 28, 2022 Posted May 28, 2022 Yes I know you cant boot a mac pro 5,1 from a usb3 pcie card .... but I was thinking .... If you installed a suitably written open core partition on an internal drive, couldn't that be used to activate the usb3/usbc pcie card in the slot so that an attached system was bootable ? just thinking Source: MacRumors
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