FIELD: recording and reproducing digital data on mirror disk. SUBSTANCE: writable and/or re-writable data recording medium has initial area, final area, and user data area. Record medium stores record protection information capable of protecting data written on record medium against unwanted superposition or erasing of record; record protection information is stored as backup file in plurality of initial area locations. As an alternative, record protection information is stored as backup file in initial area, record medium being universal random- access digital disk. EFFECT: enhanced reliability of diskrecorded data protection against unwanted recording or erasing. 9 cl, 20 dwg, 2 tbl
