Com 226 comp trouble shooting II theory book

Week9
This Week Learning Outcome
To Understand


CD ROM Failure – Symptoms and Troubleshooting


The compact disc (CD) first appeared in the commercial marketplace in early 1982. Sony and Philips developed the CD as a joint venture and envisioned it as a reliable, high quality replacement foraging phonograph technology. With the introduction of the audio CD, designers demonstrated that huge amounts of information can be stored simply and very inexpensively on common, nonmagnetic media. Unlike previous recording media, the CD recorded data in digital form through the use of physical pits and lands in the disc. The digital approach allowed excellent stereo sound quality, which does not degrade each time the disc is played, but also attracted the attention of PC designers, who saw CDs as a natural solution for all types of computer information (i.e., text, graphics, programs, video clips, audio files, etc. The CD-ROM drive is now standard equipment on both desktop and mobile PC systems. Although CD-ROM drives bring a great deal of reliable storage potential to the PC, it has not been possible to record CDs on the desktop—the technology required to create audio and computer CDs has traditionally been terribly complex and expensive, and limited by PC computing power of the day. Since the early s, CD recorder (CD-R) technology has steadily become more reliable and economical. Today, virtually any Pentiumbased PC with a SCSI bus and GB or more of hard drive space can support a CD-R drive for under
$500 (US. This chapter explains the technologies and troubleshooting techniques for CD-ROM and CD-R drives (Fig. 7-1).

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