Optical drive
The use of optical disks for storing information has become popular and a number of products are commercially available. Current optical media are roughly classified into optical media for compact disks (CDs) and optical media for digital versatile discs (DVDs). CD read (CD-R) and CD read/write (CD-RW) optical drives are widely used as optical drives for CDs. DVD-RW, DVD-R, DVD+RW and DVD-RAM optical drives are used as optical drives for DVDs. Optical drives store information on these optical media by illuminating an optical medium disk with a focused laser beam that alters the reflective properties of the medium. The information is read from the optical medium by illumination of the medium with a lower powered laser and by measuring the reflectivity of the optical medium. Magneto-optical drives typically use one or more lasers for recording information on a recording layer of the optical recording device. In optical and magneto-optical storage devices for computer systems, a beam of light is projected on to a disc surface that reflects the light in to a sensor. The surface of the dine is patterned to represent data that is typically stored in concentric tracks around the disc. The data is read from the disc by positioning the beam of light over a particular track on the disc and sensing the intensity and polarity of the reflected light from the disc. The optical data storage device typically includes two or more recording surfaces spaced sufficiently far apart that each surface can be read and recorded independently.
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