haʊˈɛvɚ, sˌʌm jˈuːfi ˌɪmplɪməntˈeɪʃənz ɪmˈiːdɪətli swˈɪtʃ tə ðə bˈaɪoʊzbˈeɪst sˌiːˌɛsˈɛm bˈuːɾɪŋ əpˌɑːn dɪtˈɛktɪŋ sˈɜːʔn̩ tˈaɪps ʌv pɑːɹtˈɪʃən tˈeɪbəl ɔnðə bˈuːt dˈɪsk, ɪfˈɛktɪvli pɹɪvˈɛntɪŋ jˈuːfi bˈuːɾɪŋ fɹʌm bˌiːɪŋ pɚfˈɔːɹmd fɹʌm ˌiːˌɛfˈaɪ sˈɪstəm pɑːɹtˈɪʃənz kəntˈeɪnd ˌɔn ˌɛmbˌiːˈɑːɹpɑːɹtˈɪʃənd dˈɪsks.
However, some UEFI implementations immediately switch to the BIOS-based CSM booting upon detecting certain types of partition table on the boot disk, effectively preventing UEFI booting from being performed from EFI system partitions contained on MBR-partitioned disks.