CD is a disc with a diameter of 12cm used in CD players.

MD is the abbreviation of Mini Disc. It is a magneto-optical disk storage medium that uses ATRAC sound coding compression technology ( Adaptive Transform Acoustic Coding) stores music, making the sound of MD comparable to CD. According to research, due to the characteristics of human hearing, when the human ear hears two sounds of different frequencies and different volumes at the same time, the smaller volume part will be ignored. ATRAC technology can ignore the parts beyond the limits of human hearing and covered by high volume during recording, and then use computer masking technology to edit and compress the data to 1/5 of the original size before storing it in MD to create a CD. Quality sound.

MV is MTV, also known as music television