Ubuntu :: Burning Split Tar.gz Files To DVD?

I am using rsync to create rotating snapshot style backups of my web files and sending them via SSH to a remote location in order to burn them for offsite storage. This is all working perfect. The remote machine is a Windows Server 2003 which has data that I combine with my web files before burning. I have cygwin installed on the remote server in order to archive and compress the entire backup using tar. (This is not a post about cygwin, I just thought I would mention it in case anyone was wondering how I was running Linux commands after transferring it to the Windows box). After compression, the backup is over 12gb. The next step in my process is to split this tar.gz file into smaller chunks in order to burn them to DVDs. I use dual layer DVDs which are 8.5gb storage size.

I also use cygwin to split the tar.gz into multiple 2gb files using the split command. When I burn them, I only put 3 files on each disk totaling 6gb to leave some padding in case this was a problem. The burn completes and says successful, although it errors out when in verification. I have tried this multiple times and it seems to fail verification at the same point every time which leads me to believe that it has something to do with the data. I have also done tests such as creating smaller backups with completely different data and brning that to a CD-R which worked fine, so I'm convinced this process can work, I just cant get it to work in the right situation. I have also tried burning one of the 7 split files to a dual DVD which also worked fine. I'm wondering if their is a chunk of data that is causing this problem in one of the other split files?