Adaptive-speed quasi-CAV algorithm in a CD-RW drive

M.-S. Mason Yen; Wai William Wang; C. H. Lester Chen; T.-T. Chen

doi:10.1117/12.390491

6 July 2000 Adaptive-speed quasi-CAV algorithm in a CD-RW drive

M.-S. Mason Yen, Wai William Wang, C. H. Lester Chen, T.-T. Chen

Proceedings Volume 4081, Optical Storage and Optical Information Processing; (2000) https://doi.org/10.1117/12.390491
Event: Photonics Taiwan, 2000, Taipei, Taiwan

Abstract

The performance of a CD-RW drive is evaluated mainly in terms of recording data rate, access time, and power consumption. Constant linear velocity (CLV) recording technology is broadly employed in almost all the commercially available CD-RW drives today. In the CLV mode, the spindle motor which is driven by the real-time linear velocity of the disc will always be braked while seeking outwards or accelerated for inward-oriented seeks. Since the motor driver is driven in saturation, additional power dissipation will occur. This is undesirable in a CD-RW drive especially during data recording and accessing and huge power consumption will thus take place. When a long sequence of recording and seek actions are taking place, the spindle motor keeps braking and accelerating to result in excessive heat generated. Further, with even higher than 16X CD-RW drives on the horizon, the CLV would not only cause over heating but also induce larger vibration to distort the system. A feasible approach to avoid the excessive heat and vibration is to employ constant angular velocity (CAV) to record the data in a CD-RW drive. Since CAV recording would require the on-the-fly optical power calibration (OPC), this imposes a totally new generation of technology requirement on the chipset and system design which are not currently available yet to the mass market. A quasi-CAV recording technique is thus proposed in this paper. This quasi-CAV recording algorithm can not only effectively reduce the heat dissipation in a CD-RW drive during recording but also avoids the complicated interaction of on-the-fly write strategy adjustment. In this paper, both experimental results and software implementation technique are presented.

Citation Download Citation

M.-S. Mason Yen, Wai William Wang, C. H. Lester Chen, and T.-T. Chen "Adaptive-speed quasi-CAV algorithm in a CD-RW drive", Proc. SPIE 4081, Optical Storage and Optical Information Processing, (6 July 2000); https://doi.org/10.1117/12.390491

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KEYWORDS

Calibration

Digital recording

Spindles

Optical proximity correction

Tellurium

Absorption

Compact discs

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