Plextor PX-708A dual DVD±RW recorder - Page 9

Writing Quality Tests - 3T Jitter Tests

We used 80min 48X CD-R media by Taiyo Yuden and burned the same AudioCD project at 8x, 16x, 32x and 40x. In the following page you can see the 3T Pit & Land Jitter graphs.

- 3T Pit results

Generally the drive did not introduce high 3T pit jitter with the specific media. The highest 3T pit jitter was reported from the discs recorded at 40x, in the outer tracks. In these areas, the jitter reached the 37nsec, which should be an acceptable level, although the Red Book limit is 35msec. The 8x, 16x and 32x recorded discs gave very good results.

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

- 3T Land results

The average 3T Land results are slightly increased over those in the previous measurements of the 3T Pit Jitter. In this case the 32x and 40x discs gave higher jitter especially in the outer part of the disc, where the writing speed was 32x and 40x, respectively (Z-CLV). The maximum reported jitter value was 39ns, and come from the measurements of the 32x and 40x recorded disc, again in the outer tracks of the disc.

The 8x writing speed also seems to produce jitter marginally higher than 35nsec, and the 16x speed is more preferable when you write your audio CDs.

- Conclusion

Plextor PX-708A generally gave good results in the jitter measuring tests. The 40x writing speed introduced the highest jitter values in the outer areas of the disc, where the jitter reached the 39nsec. Writing at 32x produced low 3T pit but higher 3T land jitter. However, those values probably do not affect the quality of your recordings.

In the following page we check the C1 and C2 error rates of the same discs, to come up with safer results.