FIELD: instrument making.
SUBSTANCE: invention relates to defect management on disks. Device for reproducing data from optical recording medium containing initial area, data and destination area, comprises head and controller. Recording medium has predetermined area for storage of substitution unit for replacing faulty unit, having defect in user data area, and list of defects. Controller controls head for reading list of defects of predefined area in optical recording medium and for reading of disc definition structure. A record of a list of defects has the first indicator, specifying a physical location of a defect unit, the second indicator, specifying a physical location of a substitution unit corresponding to a defect unit, and information on status of a defect unit and a substitution unit. Information on status comprises first information indicating whether faulty unit is single or serial, and if faulty unit is serial, second information indicating whether faulty unit is initial unit or final unit among serial defect units.
EFFECT: technical result is increased efficiency of disk space controlling.
1 cl, 15 dwg
