Abstract: Provided is a polyester-based resin composition including: (a) at least one type of dicarboxylic acid component selected from an aromatic dicarboxylic acid and an ester-forming derivative of the aromatic dicarboxylic acid; (b) a bisphenyl fluorene-based diol component; and (c) a tetracyclobutane-based diol component, wherein a content of the bisphenyl fluorene-based diol component is 20 to 90 mol % relative to the total of the diol component and a glass transition temperature (Tg) is greater than or equal to 100° C.

Abstract: A disk recording medium includes a lead-in area, a program area and a lead-out area. The program area includes: a first track on which a plurality of data signals each of which has a different index from the others is loaded; a second track on which a plurality of programs is loaded, whereby the plurality of programs consists of the sequential combination of the indices of at least one data signal among the plurality of data signals and each program has a different index from the others; a third track on which a data index table comprising the indices of the respective data signals and initial address information is loaded; and a fourth track on which a program index table comprising the indices of the respective programs and initial address information is loaded.

Abstract: A disk recording medium includes a lead-in area, a program area and a lead-out area. More specifically, the program area includes a first track on which a plurality of data signals, each of which has a different index from all of the others, is loaded, a second track on which a plurality of programs are loaded, a third track on which a data index table including the indices of the respective data signals and initial address information are loaded, and a fourth track on which a program index table including the indices of the respective programs and initial address information are loaded. The lead-in area is loaded with a table of contents consisting of the initial address information and a plurality of pointers, each of which is different from all of the others each of which designates the respective tracks of the program area and the initial position of the lead-out area.