FWIW = its not multisection - its multisession.
the only dif from finalize is that multi takes about 20MB extra for new leadin and leadout (each new session) - that is not the root of your prob
and the other guy is talking about codecs, which is also not your prob
I have seen this before. Its a burner/sw combo situation. If you are going to play it on a set top unit - it wants to see a finalized disc. From PC to PC and from DVD burner to DVD burner its a mixed bag. Most folks who burn and use the same burner to read never see the problem. Its when they give it to a friend is when things start happening.
The prob is that close the session option (not disc) is no longer given in Nero.
It may be in Roxio 7.5 or some other burn sw - dunno.
In other words, you can multisession all you want, just not read it elsewhere till you are done.
http://www.experts-exchange.com/Storage/Q_21404182.html
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A couple of comments:
There is both "one time" media (DVD-R) and "eraseable, reuseable, rewriteable" media (DVD-RW). The latter can be erased and reused, but I don't recommend it. It's expensive, slow, and the data tends to "fade" .... it's not reliable for long-term use.
However, I think that your question related not to this, but to adding data to a one-time media that is only partially full, which is called "multisession".
DVD multisession isn't as clean or as standardized as CD multisession, which works pretty much flawlessly.
The answer to "can I do DVD multisession" depends on the software and the drives -- both the record drive and the "read" drive, if you ever plan to read the DVD on a drive other than that on which it was made.
I have not fully tested Nero, but I have fully tested Roxio. With Roxio, version 5 (and earlier) cannot do DVD multisession, period. Versions 6 and 7 of the full retail product, when fully updated with the online updates, can, subject to drive limitiations.
As to the burner, some burners can burn multisession DVDs, and some can't. I have tested a number of Pioneer drives, and I found that the "04" series cannot burn multisession DVDs, no matter what software is used, while the later "08" series can. Somewhere between the 04 series and the 08 series, the drives acquired this capability, but I don't know exactly where.
However, being able to burn such discs isn't the entire issue, because when I took a successfully burned multisession DVD (burned with Roxio 7 and a Pioneer 08 drive), I found that some DVD drives could read it properly (e.g. read all of the data from all of the sessions), while others could only read the data from one of the sessions (the first or the last, I don't remember) and could not othewise read the rest of the data that was on the disc. For example, the DVD drive in my Toshiba 1415 laptop could read the entire disc, but the older DVD drive in my Toshiba 2805 laptop, while it could read the disc, was only seeing data from one of the sessions on the DVD.
Since you have Nero and not Roxio, and since you almost certainly have a different DVD burner, you are going to have to do some experimentation to answer your question. DVD multisession can work, but it doesn't work with all combinations of software, burners and DVD-ROM readers. (the matter is simplified somewhat if you only plan to read the media in the burner, but often there is a need to be able to read the media on other computers with different drives).
[Oh, one other comment: I found that some computers which could not read the media initially became able to read the media after I installed Roxio version 6. The computers in question DID NOT EVEN HAVE BURNERS IN THEM (at all),
but installing the Roxio burning software apparently adds some software to Windows (XP Pro) that enables multi-session DVD reading.]
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