A method for determining the address of a frame inside a data sector of an optical recording medium, the sector comprising a plurality of frames, each frame being preceded by a synchronization code, and an apparatus for reading from andor writing to optical recording media using such method. The partitioned confidential microdata is disguised by transforming the confidential microdata to conform to a target distribution. The conditioning optics include a housing 8 within which are contained entrance slits, multi layer Kirkpatrick-Baez mirrors, exit slits, and a stop diaphragm. Such formulations can be used to treat diseases or in diagnostic andor analytical assays. The ablation may be using radiofrequency, cryoablation, or with high intensity focused ultrasound. The openings necessary in the inside door panel for the structural elements protruding into the interior space of the vehicle are sealed, e.