The NEC ND-7551A supports the DVD+R DL/-R DL standard for writing Double Layer/Dual Layer discs with a size around 8.5 GB at a writing speed of 4x.

Testing procedure:

We created an ISO Image from a pre-authored DVD-Video compliant file set, with a total on-disc size of 8151 MB. We then wrote this image file using Nero CD Speed. Below are the results:

DVD+R DL:

Even though KProbe showed some high PI/PIF spikes at the layer change, the reading curve did not show any problems during the read-back. But there were many PIF spikes throughout the whole disc...

While the PI increases at the layer break, the average PI is good and the transfer rate test showed no problems either. However we can see these PIF spikes throughout the disc again and the second layer was only written at 2.4x.

DVD-R DL:

As mentioned in the beginning of this page, the NEC ND-7551A supports the DVD-R DL standard at 4x. Again, we used Nero CD Speed to write the DVD Image:

An excellent result on this Verbatim disc. Highly recommended media.

Standalone DVD-Player compatibility:

We only have 2 standalone DVD-Players to test the DVD+R DL media (BookType: DVD-ROM) and the DVD-R DL media (BookType: DVD-R) with:

• Tevion DVD/DivX Player DVD6000
• Yamakawa AVPhile 715

Compatibility results:

All DVD Standalone devices played both the NEC ND-7551A burned DVD+R DL media. But only one DVD Standalone devices would play the DVD-R DL media.

We would like to mention, that the compatibility issue with standalone DVD Players/Recorders and the DVD-R DL media format is caused by incompatibilities with the standalone devices used in this review, and not the NEC ND-7551A or media format used.

Summary: The writing quality on discs with two layers is good but we would like to have these PIF spikes on DVD+R DL eliminated.

DVD-R/RW Writing performance

DVD-RAM Performance