FIELD: information-carrying medium, method and device for record/playback, and central device, which can be used to ensure compatibility between information-carrying mediums, which have new additional to standard functions, and disk drive systems, which work according to existing standards.
SUBSTANCE: medium contains data area, defect control area, which is designated for defect control, which occur in data area, and access control area, which is recorded with access control data in regard to function, recognized by record/playback device, which holds the medium, and access control data in regard to function, which is not recognized by record/playback device. Record protection flag, which is written in defect control area, and access control data, which is written in access control area, form repeated initialization possibility check information to check the possibility is repeated initialization of medium.
EFFECT: ensured compatibility between new standard disk and disk drive system of an existing standard.
45 cl, 11 dwg
