9. Writing Quality Tests
Duet CD-R2-U2 slim CD-RW/DVD combo - Page 9
Writing Quality Tests
We used Taiyo Yuden 80min 48x CD-R media and burned the same AudioCD project (with CD-Text) at all available recording speeds between 12x-24x. 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 from the case of the 16x speed. In this speed, the jitter value reached 36nsec by the end of the disc. However, the value is not very high. Also notice that the jitter is increased as the drive jumps to the 16x writing speed. Generally, the results are adequate and it seems that there will be no problem writing even at the maximum supported 24x speed.
The average 3T Jitter values for all recording speeds are illustrated in the following table.
The 12x writing speeds gave the lowest average jitter values, and the 16x the highest. The average value of jitter is less than 35nsec for all the recording speeds. We could say that you can safely burn your favorite audio discs in any available speed.
- 3T Land results
The average 3T Land results are slightly increased over the the previous measurements of the 3T Pit Jitter. The maximum jitter values reported were 33ns, and came from the measurements at 16x and 24x recorded disc.
|Recording Speed||3T Pit Jitter (ns)||3T Land Jitter (ns)||> 35ns||Max value (ns)|
|12x||25.66||26.39||No||28 Pit, 33 Land|
|16x||32.02||31.59||Yes||36 Pit, 33 Land|
|20x||30.51||30.63||No||34 Pit, 32 Land|
|24x||29.61||30.23||No||32 Pit, 33 Land|
The average 3T Pit and Land jitter values are below the 35nsec standard for all the recording speeds. The 16x 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 results. Moreover, the Z-CLV technology adopted for 16x and 32x speeds does not affect the writing quality.