By Lee Purcell
Made a tough topic for me to appreciate a lot more straightforward. rather well written.
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Extra info for CD-R/DVD Disc Recording Demystified
This difference is detected as a phase shift in the light beam. This basic technique and some closely related variations make it possible to store and retrieve data from the surface of an optical disc. As with all things digital, the pattern composed of pits and lands— relayed as a electronic string of 1’s and 0’s by the photodiode—can represent much more complex analog equivalents, such as the envelope of a soundwave or the passage of shapes and colors in a video sequence. Figure 2 - 1 illustrates the fundamental components of a CD-ROM drive (which are not drawn to scale).
The frame encompasses a collection of bits: some of them signify data, others allow the laser to be synchronized with the spinning of the disc, and still others contribute to the error-correcting capabilities within the CD-ROM equipment. Of this collection of bits, only twenty-four 17-bit units (408 bits altogether) can be translated into 8-bit bytes. As you can see, many additional bits are needed to convey the information contained in a mere two-dozen data bytes. Physical Differences in Recordable CDs Recordable CDs differ in some important ways from standard, mass-replicated CDs.
In fact, Chapter 10, Simple Authoring Techniques, provides a number of tips on how you can create CD-ROMs and DVD-ROMs using simple tools and simple processes. These tips and guidelines should be helpful to everyone from the businessperson who needs to put a PowerPoint presentation on a CD for the next corporate meeting to the experienced developer who needs to best way to encode video to produce a training session on DVD-Video. Dealing with Performance Issues For all the promise of optical storage, and despite the fact that 20x, 24x, and even 32x CD-ROM drives have appeared on the market, you are still dealing with a storage device that must work vigorously to deliver data fast enough so that your system can play it back smoothly.