Like with the DVD-R recorded at 4x speed, no problems arose during the burn process proper, only the vacillation of the burn speed is stronger now. The quality of the resulting disc is different, however. There are no high peaks of PI failures and the PI error rate is low, too. The small total number of PI error blocks on the disc (12671) is another sign of the high quality of the recorded disc.
The Beta graph is normal, with minor fluctuations at the beginning. The second half of the graph is a horizontal line that closely approaches the zero mark. The Jitter rate remains roughly the same on the entire disc. Judging by the results of the TA Test, the drive finds it difficult to maintain the necessary lengths of small pits/lands (3T and 4T). The Peak Shift is rather big, too. The average length of the pits and lands is a little shorter than it should be. So, despite the small number of errors, the quality of this disc isn’t ideal. Let’s switch to 8x burn speed now.
The burn process is identical to what we’ve seen in the DVD-R 8x test. The same burn algorithm is employed, making the whole burn session last longer. The drive only began to work at 8x speed at the middle of the disc, while modern models that use a P-CAV algorithm reach this speed as soon as they pass one fourth (or, sometimes, one third) of the surface of the disc.
The quality of the resulting disc makes you forget about the small time loss, though. The PI error and failure rates are very low; the total of PI errors is very small, too. Yes, there are two surges of errors on the second half of the disc, but they aren’t lengthy and won’t affect its readability.
The Beta graph betrays the moments when the drive switched between the zones of the Z-CLV algorithm, but the fluctuations are small and remain within the acceptable range. This “step-like” burn algorithm affects the uniformity of the Jitter rate, too, but again not as strongly as to mean any possible troubles. The drive still has problems with maintaining the necessary lengths of small lands/pits, but makes them somewhat better than at 4x speed. The Peak Shift remained as big as at 4x speed. So, the quality of the disc is high, but not perfect.