Magnetic tape is a kind of magnetic tape material with magnetic layer, which is used to record sound, image, digital or other signals. It is the most productive and widely used magnetic recording material. It is usually made by coating a layer of granular magnetic material (such as needle-like γ-Fe2O3 magnetic powder or metal magnetic powder) or evaporating a layer of magnetic oxide or alloy film on the plastic film tape base (carrier). Paper and celluloid were first used as the base material of adhesive tape, and now polyester film with high strength, good stability and no deformation is mainly used.
CD stands for laser disc, which is a common term used in all CD media formats. Some CD formats on the market now include audio CD, CD-ROM, CD-ROM XA, photo CD, CD-I and video CD. Among various CD formats, perhaps the most familiar is audio CD, which is a standard CD format for storing sound signal tracks such as music and songs. Other abbreviations: English crossdress, abbreviated as CD, abbreviation of "critical dimension" in semiconductor industry, and so on.
Mp3 is a player that can play music files. Saehan Company introduced the world's first MP3 player-MPMAN F10 in/998.