sˌʌm ˈɪntɛlbˈeɪst mˈækɪntˌɑːʃ kəmpjˈuːɾɚz hæv lˌɪmɪtˈeɪʃənz wɛn bˈuːɾɪŋ fɹʌm jˌuːˌɛsbˈiː dɪvˈaɪsᵻz wˌaɪl ðɪ ɛkstˈɛnsᵻbəl fˈɜːmwɛɹ ˈɪntɚfˌeɪs ˌiːˌɛfˈaɪ fˈɜːmwɛɹ kæn ɹˈɛkəɡnˌaɪz ænd bˈuːt fɹʌm jˌuːˌɛsbˈiː dɹˈaɪvz, ɪt kæn dˈuː ðɪs ˈoʊnli ɪn ˌiːˌɛfˈaɪ mˈoʊd.
Some Intel-based Macintosh computers have limitations when booting from USB devices – while the Extensible Firmware Interface (EFI) firmware can recognize and boot from USB drives, it can do this only in EFI mode.