in accordance with the duplication of bit - patterns on a recording medium of the present invention , presence of gaps as defined by one or more words of predetermined code in data is judged , then with having these gaps as the write - succession points , and placing an unwritable bit - pattern in these respective gaps , data is written in onto the recording medium of the transfer - destination . thus , the write - succession points can be determined , and the occurrence of bit - shift can be avoided . in addition , transmission of data on the recording media over a long distance become possible .