 In the first BD-RE specification (defined in 2002), the BDFS (Blu-ray Disc File System) was used.The BD-RE 1.0 specification was defined mainly for the digital recording of high-definition television (HDTV) broadcast television.The BDFS was replaced by UDF 2.50 in the second BD-RE specification in 2005, in order to enable interoperability among consumer electronics Blu-ray recorders and personal computer systems.