| 摘要 |
PURPOSE: To allow easy calculation of remaining recordable time, recordable number of melodies, and playing time of each melody by summing the data length of segment shown on all parts tables coupled through link information and expressing the total data length in terms of time thereby calculating the operating time. CONSTITUTION: When a magneto-optical disc 1 is loaded, TOC information is read in and stored in a TOC memory. When a user requests display of recordable time through an operation input section, a system controller 11 processes a routine automatically using U-TOC data. At first, a total value (sum) is prepared and reset to an initial value 0. Subsequently, data is read out from a corresponding table designation data P-FRA and the data is set as a variable (i). i=(00) represents 0 remaining recording time. If (i) is not 0, segment length recorded on a parts table is added to the variable (sum). The link information is set as (i) and the total data length of segment is added to the (sum). When i=0, total data length of empty data area is expressed in terms of time thus determining a recordable time.
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