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Rewritable Media


Quality of the DVD-RW disc recorded at 2x speed

The drive performed the burning successfully and the quality of the disc is quite high. The PI error rate grows up somewhat towards the outermost tracks, but still fits into the required range. On the rest of the disc’s surface, the PI error rate is 10 in average – an excellent result for a rewritable medium. There are rather many PI failure blocks, but the average rate of PI failures is only 2, with several peaks of 3 failures. That’s a good result, too.


Beta/Jitter and TA Test (Outer) for the DVD-RW disc recorded at 2x speed

The high quality of the disc is confirmed again: the Beta value changes but slightly and always remains within the acceptable range. The uniformity of Jitter is acceptable, too. According to the TA Test, the drive maintains the required pit/land lengths and the Peak Shift is very small. Will we see the same quality at 4x burn speed?


Quality of the DVD-RW disc recorded at 4x

The burn session was completed successfully and the quality of the resulting disc is high. The PIE/PIF rates (8 and 2, respectively) are much lower than at 2x burn speed. The total number of PIE/PIF blocks is very small, too.


Beta/Jitter and TA Test (Outer) for the DVD-RW disc recorded at 4x speed

Beta fluctuates more, but is still within the acceptable range. Note that the drive is reducing the laser power from the innermost towards the outermost tracks of the medium. At the end of the burn session the asymmetry becomes close to zero. The Jitter rate is uniform, but is worse than at 2x burn speed – there are two splits on the graph that spoil the result somewhat.

According to the TA Test, the Jitter rate is higher than at 2x burn speed. The Peak Shift remains unchanged, so the quality of the disc is roughly the same as at 2x. Now let’s see what we have with DVD+RW media.

 
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