DVD disc is not magnetic material?
Using reflective film pressing disc or sintered into concentric different lengths of reflective and non reflective pits record information, read the time hair out of the laser signal irradiation pits, read back signal reflecting the length of digital signal is converted back to record.
No Is the use of CD reflective film pressed or sintered into reflective and non reflective recording information pits concentric of varying lengths, read out signal of laser irradiation time hair pits, read back reflection signal length, converted back to the record.
