- Writing Tests

We burned some DVD+R DL and DVD-R DL discs with data content. For this task we used "Create Data Disc" from Nero CDSpeed in order to fully burn the discs.

Mitsubishi Chemicals 8X DVD+R DL @ 8X

The specific DL disc from Mitsubishi Chemicals is certified for 8X burning, one of the few if not the only one. Since it is new, most burners don't support it at 8X, but fortunately the ND-4550A does, since it is a relatively new burner.

According to the above graph, the writing strategy is Z-CLV. The reported time of 18:45 mins is high. The drive starts the burning process at 4X and then speeds up to 6X. After 2.2Gb the ND-4550A reached the maximum 8X which it didn't retain for a long, where just before the layer change it dropped back down to 6X only to hit 8X again in the second layer, then down to 8X and finishing at 4X.

Traxdata 8X DVD+R DL @ 6X

The 20:25 mins that the NEC took to burn the Traxdata 8X DVD+R DL disc is too long, being recognized and burned at 6X. The media is certified for 8X writing, so an update is required in the supported media list...

Mitsubishi Chemicals DVD-R DL 4X @ 6X

This DVD-R DL media, according to the manufacturer, is certified for 4X recording while the ND-4550A burned it at 6X. The writing strategy according to CDSpeed is Z-CLV. Most of the disc was burned at 6X and only a small portion at the beginning and at the end was the speed 4X.

We also tried with the only DVD-R DL certified for 8X, from Mitsubishi Chemicals, the MKM 03RD30, which the drive couldn't burn at 8X, but only at 2X.