USB 3 cards should all be bootable by now?

Discussion in 'Mac Pro' started by macmesser, Mar 11, 2016.

  1. macmesser macrumors 6502a

    Aug 13, 2012
    Long Island, NY USA
    Should I be checking bootability on currently available USB 3 cards for Classic Mac Pros or should they all pretty much be bootable? If it is not safe to assume they will be bootable in latest OS, what's the reason (other than they weren't made that way :p)?
  2. rawweb macrumors 6502a


    Aug 7, 2015
    No USB 3 PCIe card is bootable in a Mac Pro 1,1-5,1 as there is no driver support until an operating system loads drivers. USB 3 is not in EFI.

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