Optical disk
Optical diskOptical driveLight（Semiconductor laserElectronic intelligence is read and written) with reflectionRecord medium. In material,Polycarbonate、Poly- methacrylic acid methyl、Epoxy resin、Annular olefin resin、Poly- lactic acidAnd so on is used.
Magnet-optical diskUsing light, the part which it reads out is common, butMagnetismUsing, the point where it records differs. It is used with music useMinidiskThe disk for sound recording of optical magnetic type has circulated mainly, but also those where portion or all of the board surface become the playback private optical disk exist.
Type of optical disk
- compact disk (Compact disk; CD)
- laser disk (Laser vision disk; LD)
- Optical disk for digital data (Optical digital data disk; OD3)
- DVD (Digital Versatile Disc)
- Blu-ray Disc(BD)
- HD DVD
- SACD
- UMD(Universal Media Disc)
Furthermore, from the fact that recording density and rpm etc. already have reached to the physical limitation, efficiency of the optical disk is said with the appearance of BD and HD DVD that it levels off.
