Yes i m from Italy.Sorry for my hurry but i m very frustrated from this story,i ve also mailed Pioneer ,i hope they ll answer me...
Well,the situation is this: The 3 Verbatims that NEro DVD Speed said had errors were in deed having problems.Both the Toshiba DVD-ROM and The Pioneer couldn't read them at some point,and Windows media player was giving read error too...
Now,till now i have tried Verbatim DVD-R 4x,Vivanco DVD+R 2,4x and Memorex DVD-R 4x (CMC).I only had problem with the 3 Verbatims,however in ALL cases the Nero DVD Speed line is zig zag just like the one i posted before.
Now,i have DVD Info Pro 2.31 and here is the result (sigh!):
About Multisession: Nero warns me that multisession on DVD-R is possible ,but the sessions after the 1st may not be readble on some stand alone DVD players and Windows prior to XP.
I frankly don't care of that much,as till now i ve only written one session,i just left the DVD "open" in case i could put a bit more data later,since there were about 300 MB left in each DVD.And i don't have stand alone player,i just use mu PC for everything.
However i also burnt some DVD as single session like the one i just posted the pic of ,in DVD info Pro. They are burnt all alike.
In DVD Info the drive seems that can't go more than 2.60x while in Nero DVD Speed exceeds 8x.Not to mention the zig zag line in all 3 DVD brands i used.
Thank you all for the help!