Video compact disc and super video compact disc drives of electronic date and voice computer, have identification marks, where plain coil chain drive carries constant load calculation

摘要

The video compact disc (VCD), super video compact disc (SVCD) drives of an electronic date and voice (EDV) computer have identification marks. An audio multi-head laser, which is made of graphite, has a diamond to read the VCD or SVCD under the influence of the passing speed. A plain coil chain drive carries a constant load calculation.