Philips JackRabbit32 CD-RW/DVD drive - Page 7

Writing Quality Tests

We used Taiyo Yuden 80min 48X CD-R media and burned the same AudioCD project (with CD-Text) at all recording speeds between 4x-32x. Below you can see the 3T Pit & Land Jitter graphs.

- 3T Pit results

As we can see from the above graphs, the 3T Pit Jitter stays below the 35ns Red-Book limit for all the available recording speeds, except for the 4x case. In this speed, the jitter value reached 38nsec at the 55-60min playback of the disc. However, the value is not very high and it is lowering again by the end of the disc. Generally, the results are adequate and it seems that there will be no problem writing even at the maximum 32x speed.

The average 3T Jitter values for all recording speeds are illustrated in the following table.

The 16x writing speeds gave the lowest average jitter values, and the 4x the highest. The average value of jitter is less than 35nsec for all the recording speeds. Since the differences in the average jitter values is very small, we can claim that you can safely burn your favorite audio discs in any available speed.

- 3T Land results

The 3T Land results are slightly increased over the previous measurements of the 3T Pit Jitter. The maximum jitter values reported were 39ns, and come from the measurements on 4x recorded disc.

- Conclusion

The average 3T Pit and Land jitter values are below the 35nsec standard for all the recording speeds. The 4x recorded discs gave some slightly increased values but it seems that they cannot influence the overall quality. The combination of low writing speeds and the CLV writing technology seems to guarantee the quality of the results. We may also see that the Z-CLV technology adopted for 16x and 32x speeds does not affect the writing quality.