Actually, my need for spanning is part of our backup plan at my work. We have 4 external harddrives which we use for backuping regularly (so we have always 4 backups that are 4 different times back in time), but once per 3 months I take recent harddrive backup and make 2 sets of backup DVDs from it, which goes to archive. This is why I need to have each disc independent on others and readable without any third party app - so it means there can't be any chopped archives and all files have to be burned directly as they are - because if one disc accidentally fails, others are not affected (they are independent)... And I have to say, I never experienced any problems with this (the oldest backups are 10 years old - of course on CDs) - if the medium is bad, it fails verification, but all that burned successfully are fine even now... I think it is maybe about how you store disc too...
Since you posted this in the "Sales Questions" area, I'm guessing you don't actually have Creator 2009.
Attached are screen shots of the two apps (Data Disc in the Home app and Creator Classic) that can be used to create data discs and the related help file info regarding disc spanning.
Both appear to essentially do what you asked about, but I think the Home Data Disc one is closest to what you have been doing. About the only way to be sure is to actually get the product and try out a small project on some RW test discs. They don't have a trial version of the software, but if you purchase it thru their online store, they do have a 30 day return policy if you're not happy with it.
I, like others that have posted, don't recommend or use disc spanning. I think there are better and more cost effective ways to do what you've described.
I just thought these screen shots might give you some more information to help answer your questions.
This post has been edited by Larry: 24 March 2009 - 06:03 AM