Abstract: A method of recording data is disclosed wherein data is recorded onto a recording medium having a plurality of tracks provided side by side. The data recording method includes sequentially recording a series of data on a track from one side of a medium; writing index information, including position information, of a last recorded track, after the series of data are completely recorded, in an area of the medium different from the area where the data is recorded; reading out the position information and seeking the last track on the basis of the position information read out and recording the next data on a track next to the sought last track.

Abstract: There is disclosed an information recording medium having an area for recording data and an area for recording a directory used to manage the recorded data, by providing an area for recording information indicating logical erasure of the unnecessary data. In the information record method of the present invention, when unnecessary data is produced, information indicating the logical erasure of the data is recorded in the area of the information record medium in which the directory is recorded.