Pacific Digital U-30201 DVD±RW recorder - Page 10

Writing Quality Tests - 3T Jitter Tests

Here we used 80min CD-R media from various manufacturers and burned the same AudioCD project at 40x. The following graphs show the 3T Pit & Land Jitter results.

- 3T Pit results

While all media, except for Ritek, exceeded the 35nsec level, most managed to stay within limits, exceeding only towards the end. The worst was with Fujifilm media which was consistently at or above 35nsec while Ritek media was the best by far. As with Taiyo Yuden media in the previous set of tests, so here we have a difference in performance between the Pacific Digital and LiteOn drives.

The average 3T Jitter values for all manufacturers discs are illustrated in the following graph. Notice the difference between Ritek and the other manufacturers media, and especially Fujifilm media which has an average value of 36.29.

- 3T Land results

As was the case with the LiteOn drive, so too here there is an almost steady increase in land jitter as writing progresses from inner to outer tracks. The Ritek media was again the only media that managed to stay below the critical 35nsec.

The average values are presented below. This time SKC media returned a high average value.

- Summary

It is quite evident that the drive gave best results with Ritek media. It was the only media that did not go over the Red Book limit. In general, while the results are not that bad, they are not as good as we would have expected, especially considering the good results returned for these same tests by the LiteOn LDW-811S drive.

On the following page we check the C1 and C2 error rates for the same discs. These are the last of the quality tests.