def __init__(self, fh: 'BinaryIO', mode: str='rb+', sector_size: int=512):
    self._fh = fh
    self.mode = mode
    self._sector_size = sector_size
def __init__(self, fh: 'BinaryIO', mode: str='rb+', sector_size: int=512):
    self._fh = fh
    self.mode = mode
    self._sector_size = sector_size