IF you are getting CRC errors the disks can be repaired by using DVD Resuce which is part of DVDXCopy. Another way of burning these are by using a NT command called ROBOCOPY. Robocopy is used to copy all folders.
Here is an Example : Being that ROBOCOPY.exe is in the root of c drive
c:\Robocopy e:\video_ts c:\dvd
What this does is copy the whole directory to a folder on c drive named DVD. Then use Nero and select MAKE DVD and place all the files in the VIDEO_TS directory and burn away.
Make sure you use your DVD reader to copy to the hard drive as does not always work with the burner.
I use a Lite-on DVD reader model SOHD-167T and used the firmware update posted in my other thread by http://codeguys.rpc1.org
Also my burner is a pioneer 108. I did have a Ricoh 4x and worked fine as well.