Sustain in which information is contained (in the form of a combination of micro-grooves and places without them).

They are read with a semiconductor laser (AlGaAs) with a wavelength of about 780 nm. The recording creates a spiral path from the center to the edge of the record. The rotational speed of the plate is varied such that the linear speed of the read head with respect to the track is constant and for the reading speed x1 it is in the range of 1.2 to 1.4 m / s.
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