On camcorders I have mini disc from a Sony CD Mavica I need an apt to copy them to My Mac book either free or buy one?

Robsteriark

Minidiscs were encoded in a format which is difficult to convert directly without severe loss of quality. The only practical way is to connect the audio output of the player to the audio input of your sound-card and then allow your computer to convert the audio in real time to whatever format you prefer. If you go into the settings of any Sony MD player you can select the headphone socket to totally bypass the volume controls to become a pure unadulterated line output. Regular MiniDisc players also do not allow any form of direct digital output. Only the much rarer MiniDisc HD allows that.