Halc
Posts: 60
Joined: 2/4/2002 From: Status: offline
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Err... can you rephrase? I don't understand, sorry. The facts as I've understood them for dvd testing are as follows: 1) Indirect measures are not true characteristics of the disc. They are ALWAYS the measure of both the disc and the reader. Of course, at slower reading speeds the drive does not have to stress itself as much and the true disc characteristics show through more easily when looking at indirect measurement data. 2) For DVD Indirect measures include (but are not necessarily limited to): asymmetry, reflectivity, push-pull (tangent.), radial noise, tracking signal, dc jitter and of course PIE/POE error rates. 3) For DVD true disc characteristics include: Track pitch, scanning velocity, information diameters, birefringence, substrate thickness, index of refraction, etc. 4) There is no "DVD metric standard reader" as there is one for CD measurement. As such, the Pulsetec drive is based on averages from various manufacturer's input. Is is not "the ultimate in drive performance" that all other readers/analyzers should aim for. It is just a very reasonable average. The best in the industry at the moment. As such, regardless of the reading speed, indirect measures are always measures of both disc low level characteristics and the reader (even in CATS/Falken with current Pulsetec drives). best regards, halcyon Refs: DVD Testing Principles and Practices, Gerger. S., ODS 7-8/1998 Universal Disc Measurement, ODS tech papers, Replication & Duplication, ODS News, 1-2/2004 How to interpret the CATS test protocol, AudioDev, 2003
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