recording on a storage medium, in a first modulation format, at a position following a guard band, a management table configured to manage a replacement area for a defect area in a data area in said storage medium, a reserve track, and a file allocation table, the reserve track and the file allocation table being located on an outer side of the management table on the storage medium;

recording a unique identification in said management table;

recording, before the guard band, management data for managing said management table on said storage medium in a second modulation format and an alert sound track, the management data including a start position of the alert sound track recorded in the second modulation format and a start position of an area for data storage in the first modulation format, the alert sound track being located on an outer side of the management data on the storage medium;

determining whether a user has set a switch indicating an operation mode of a disc drive unit is a current MD system;

displaying a query for the user to confirm that a format of the storage medium should be canceled, when the determining step determines that the user has set the switch; and

in response to input by the user to the query, changing said first management data and deleting said alert sound track.