FIELD: optical engineering.
SUBSTANCE: position information us recorded in guiding grooves of optical disc. Signal sync group achieved when reading position info from disc out differs from signal sync group of disc of other type which operates at different mode of formatting and recording. Density of recording of optical disc differs from density of recording of other type disc. Sync group has high level value at preset period or at period being higher than preset one followed by value at lower level for preset period or for period being bigger than preset one which speaks of standard or high density of recording.
EFFECT: higher possibility of identification.
18 cl, 35 dwg
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