Abstract: A write once-type recording medium with a guide groove has a first management data for constantly managing a position of a track in the groove after data-writing/reading is excuted and a second management data for managing the data-writing, both optically recorded on a position in the groove displaced from that position.

Abstract: A method for recording information intermittently on a write-once recording medium, comprising the steps of; providing on the recording medium a volume management area and a data area, recording an information and a management information for managing the information recorded, to the data area and the volume management area respectively, adding another information to the data area, renewing the management information for managing the information previously recorded and the information added as a whole and adding the renewed management information to the volume management area, and filling a non-recorded area between the last position of the management information added lastly and the start position of the data area with dummy data for making all of the recorded area contiguous.