Abstract: Aiming at the bandwidth mismatch between record process and convert process in high-speed data recording system, factors that affect convert process bandwidth are analyzed, and a more flexible and practical data recording method based on file system is proposed. The method divides storage memory into consecutive information management space and data storage space by establishment of file system in advance. In record process, data is recorded in data storage space consecutively and in convert process, information management space is modified. Thus, without decreasing record bandwidth, the method could improve the bandwidth in convert process to achieve high-speed file conversion.