[B]Arachne[/B], as [B]kg_evilboy[/B] has said this is typical of NEC burns in general and the NEC 3550…4551 in particular.
The theory says that PIF spikes at re-calibration points shouldn’t matter if they are outside of the actual data, but my BenQ DW1655 drive, my LiteOn SHW-1635S drive and my old Matshita SR-8175 DVD-ROM drive don’t “like” a lot of discs burned on the NEC 4551.
I get ugly Read Transfer tests in my LiteOn 1635S drive of some of the DVDs burned on my NEC 4551 (see this thread).
I get occasional discs with unreadable sectors such as this one, and also the following one with Read Transfer test problems that [B]kg_evilboy[/B] found:
[B]Arachne[/B], I suggest you perform Read Transfer tests of the DVDs you burn in your NEC 4551 until you’re convinced that your NEC drive produces discs that can be read in your BenQ drive. Hopefully you wont have the same problem that I have.