Manual de instrucciones de Philips Compact Disc Recordable

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Thermo-Balanced Writing
Thermo-Balanced Writing
Thermo Balanced Writing
for optimal recording

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62200223-TBW 21-02-2001 16:15 Pagina 4 Thermo-Balanced Writing A new, patented, system addressing the problem of writing reliably to the very many brands of recordable CD media now on the market, not all of which are in conformance with the agreed international standards established for use in Philips CD-RW drives. Introduction The explosion in demand for CD Recordable (CD-R) discs and the relentless pursuit of ever lower costs and higher speeds has led to the production and sale of a great

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62200223-TBW 21-02-2001 16:15 Pagina 6 Thermo-Balanced Writing temperature Fig.1,Thermo- laser beam Balanced Writing: Typical Heat Profile during CD-R write phase.Goal of TBW is required temperature to to ensure a correctly burn a pit balanced heat profile during this phase. diameter of pit is smaller than diameter of laser spot laser spot Equally of course, if the pits come out too small or too light, then other reading errors can occur. If a CD-R drive has no way of controlling the burn pro

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62200223-TBW 21-02-2001 16:15 Pagina 8 Thermo-Balanced Writing Unfortunately, there is no reliable way a consumer can judge what he or she is buying (as example, an authoritative quality logo on the disc packaging or verification of media confirmance), and so when an End user buys and "burns" what are, in effect, sub-standard discs, any resulting problems are liable to be attributed more often to the CD drive unit then to the disc. It is a question of compatibility, something the End user imp

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62200223-TBW 21-02-2001 16:15 Pagina 10 Thermo-Balanced Writing If this initial test shows some discrepancies, then the algorithm goes to its main sequence. In one or more test burn/read iterations the required burn pulse data is recalculated, and if necessary, the disc is reassigned to the next lowest drive speed available.The calibration stops when the results show a correct performance within defined tolerances. The disc is then recorded with the revised conditions. What happens is a fast

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62200223-TBW 21-02-2001 16:15 Pagina 12 Thermo-Balanced Writing Fig.3 (Fig. 3a & 3b), fig 3a: Without TBW fig 3b: With TBW Thermo- Balanced Writing: Thermal “cross-talk” is reduced by TBW. Pit Pit The standard for Pit and Land length is represented by an intersection of the horizontal and vertical lines. The plots, representing the individual measurements of each Pit and Land, in ideal circumstances (no “cross-talk” as example), should be located on the intersections themselves. The black “do

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62200223-TBW 21-02-2001 16:15 Pagina 1 Thermo-Balanced Writing Philips Optical Storage Building SFH3 P.O.Box 80002 5600 JB Eindhoven The Netherlands www.components.philips.com © 2001 Royal Philips Electronics N.V. All rights reserved. Specifications are subject to change without prior notice. Reproduction in whole or part is prohibited without written consent of the copywright owner. 3104 145 550 901 Printed in The Netherlands 2/01