Plextor PX-716A burning/reading an 8x DVD+R disc
 

The burning was completed without problems. The drive uses the P-CAV algorithm with a very small time necessary to achieve the max burn speed. It helps the PX-716A to turn in one of the best results of this test as concerns the duration of the burn session, especially considering that some modern drives still use the Z-CLV algorithm even at 8x speed. The write graph again clearly shows the moments when the Running OPC mechanism adjusts the power of the laser. The resulting disc was subsequently read without errors and at the maximum declared read speed. Now let’s check out its quality.

The superb quality can be observed here, too. The previous model also produced high-quality discs at this burn speed: the quality was up to the mark almost on the entire surface of the disc, but there was a rather high spike of PI errors and failures on the outermost tracks that spoiled the overall impression somewhat. This latter defect is not present on the disc burned by the newer model: the highest quality is maintained throughout the entire surface of the disc. The number of PI errors has diminished by 45%, while the number of PI failures by a factor of 50! The PX-716A doesn’t cease to astonish us…

Beta/Jitter and TA Test (Inner, Middle, Outer)
for the disc burned by Plextor PX-716A
 
 

The asymmetry is within the norm; its deviations are small and acceptable. The jitter rate is almost the same along the disc: it is growing till the disc reaches its max burn speed and then the graph is almost a perfectly straight line. The results of TA Test also confirm the low jitter rate of the resulting disc. Minor overlaps occur at small pit/land lengths (3T-5T) that are the most difficult for any drive to maintain. The overall score is also somewhat reduced due to the average Peak Shift.