Rewritable Media

Next go the rewritable media formats.

Both drives succeeded in burning a DVD-RW disc. The new model doesn’t have the slumps of speed on the outermost tracks the previous model had when reading the burned disc. Does it mean the quality has been improved?

It is really so. There is no surge of PI errors and failures at the end of the disc the Plextor PX-712A suddenly dropped its read speed because of. The total number of PI errors has diminished almost in double with the new drive, but the total number of PI failures has become higher. PI failures occur more frequently, but their average rate doesn’t exceed 2 which is a very good result. Thus, the overall quality of burning DVD-RWs at the minimal speed has improved considerably.

TA Test for the DVD-RW 2x disc burned by Plextor PX-716A


 

It’s easy to see that the jitter is diminishing from the first tracks to the outermost ones which is an indication of an efficient laser power correction mechanism. The quality of the disc is good overall, although the jitter rate might have been smaller on the innermost tracks, considering the minimal burn speed.