INFORMATION RECORDING MEDIUM AND INFORMATION RECORDING DEVICE Russian patent published in 2013 - IPC G11B7/07 

FIELD: information technology.

SUBSTANCE: in the information medium, each of the information storage layers has a test recording area for determining laser beam power when recording. There is a difference of radial arrangement between the outer peripheral edge of the inner test recording area from test recording areas in the i-th and (i+1)-th information storage layers and the inner peripheral edge of the other outer test recording area, which is greater than between the outer peripheral edge of the inner test recording area from test recording areas in the j-th and (j+1)-th information storage layers and the inner peripheral edge of the other outer test recording area.

EFFECT: determining the best recording power for each recording layer in a multilayer medium.

11 cl, 23 dwg