Labels:book | clock | gazette | sky OCR: SECTION c CHAPTER The surface of an optical disk is coated with clear plastic, making the disk quite durable and less susceptible to environmental damage than data FIGURE 2-28 recorded on magnetic media An optical Idisk, such as a CD is not suscepti- CDs DVDs, and Blu-ray discs ble to humidity "fingerprints dust, magnets, or spilled soft drinks Scratches are constructed with one on the disk surface can interfere with data transfer, but poo6 buffing with more layers of recording sur- toothpaste can erase the scratch without damaging the underlying data. An face sandwiched between optical disk's useful life estimated to be more than 30 years. Figure 2-28 protective plastic. illustrates the layers of an optical disk How fast are CD DVD, and Blu- ray drives? The original CD drives Polycarbonat ...
