Both GPT- and MBR-partitioned disks can contain an EFI system partition, as UEFI firmware is required to support both partitioning schemes.
bˈoʊθ dʒˌiːpˌiːtˈiː ænd ˌɛmbˌiːˈɑːɹpɑːɹtˈɪʃənd dˈɪsks kæn kəntˈeɪn ɐn ˌiːˌɛfˈaɪ sˈɪstəm pɑːɹtˈɪʃən, æz jˈuːfi fˈɜːmwɛɹ ɪz ɹᵻkwˈaɪɚd tə səpˈoːɹt bˈoʊθ pɑːɹtˈɪʃənɪŋ skˈiːmz.