gistfile1.txt

def is_zeroed(device_name, buffer_size = 2048):
    zero = "\x00"

    with open(device_name, "rb") as file:
        buffer = file.read(buffer_size)

        while buffer != "":
            if not all(c == zero for c in buffer):
              return False

            buffer = file.read(buffer_size)

    return True