Let’s start with the maximum burn speed; it is 40x this time.
The BLER on the disc written by the junior model is even lower when the disc is being read at 4x speed. The Symmetry and Jitter are normal; the shape of the graphs is almost the same as we saw above. There are nearly no overlaps in the histograms. Minor overlaps of small lengths (3T-5T) appear in the Land Histogram only. This is not an ideal result, but highly satisfying nevertheless.
As for the GO-0804A, the BLER is low, too, at the low read speed, at least lower than the disc was being read at 24x. But here the Symmetry goes out of the acceptable limits since the middle of the disc. The Land Jitter parameter is too high, about two times higher than it should possibly be. The numerous overlaps in the histogram confirm this fact. As I mentioned above, the quality of this disc is much worse than compared to the disc produced by the junior model. Now we’ve got another confirmation and an in-depth analysis why and what exactly parameters are out of the norm.
The Symmetry parameter has grown somewhat with the junior model – it is within the norm, but close to the limit. The Jitter has decreased, and the Land Histogram has a normal look now. The drive maintains the necessary pit lengths. Overall, although the BLER has grown a little (only when the disc is being read at high speeds), the quality of the recorded disc has improved compared to 40x.
What about the more advanced model, the GO-0804A? The Jitter is lower, too, but is still higher than the allowable maximum. The look of the Land Histogram has improved – there are only minor overlaps left. That said, the result is still far from perfect. We see that there’s no indication that the spike of C2 errors at this burn speed was due to a defect of the disc. Moreover, there’s no such spike at all when the disc is being read at 4x. In other words, this is the drive’s fault, rather than the disc’s, and it only shows up at high read speeds. The Symmetry is still out of the norm, but improves somewhat at the lower burn speed.
The surge of C2 errors may have been an accidental defect at reading, so the results of the drive are better in this test. However, they are still just satisfying, and not more. Note again that I’m talking about the more advanced model of the two now!
Even when the burn speed is the lowest, the GO-0804A cannot produce discs of an acceptable quality. All the problems persist here, too. Curiously enough, there’s a defect at the end of the disc – the BERL surge, the sudden increase of E12 and E22 errors and the RN spike are a sign of a fault of the medium. But the earlier tests haven’t found any sizable surge of C2 errors in this spot.
The junior model reduces the quality at 16x burn speed. This shows as a higher Land Jitter and as overlaps in the histogram. Not all drives are capable of recording high-speed blanks at the minimal speed as successfully as they do at the maximum speed – and the manufacturers warn the users about that. By the way, we see that the C2 errors spike is due to the medium’s defect (note the surges of E22 and E12 errors and of the BERL in this spot). The Symmetry is out of the norm at 16x for both drives.
All in all, the junior model produces CD-R discs of a much higher quality compared to the GO-0804A. The optimal speeds for the GO-0404A are 40x and 24x. As for the GO-0804A, I can only recommend that you use it at the maximum burn speed. But even in this case you shouldn’t hope for a high quality of the resulting discs. Meanwhile, there’re no firmware updates at the manufacturer’s website. It’s really a big question if they are going to take any measures about that…
Now let’s deal with CD-RW burn quality.
In spite of the identical speed formula, the GO-0404A took 15 seconds less to burn a CD-RW disc. This difference receives explanation if you take a look at the burn graphs above. The top-end model uses the Z-CLV algorithm for burning, while the junior works with the P-CAV algorithm. Although they both reach their maximum speed at the same time, P-CAV proves to be faster due to a smooth acceleration of the burn speed. Some drives have troubles coming over to another zone when reading discs written with the Z-CLV mechanism. This time, however, the read graphs are smooth and clear, but what about quality?