My Mac(s) won't verify DVDs

I've been trying to backup lots of files onto DVD. I've tried DVD-R and DVD+R on my iMac (10.4.11) and my Macbook Pro (10.5.5). DVD+R don't work at all on my iMac and when I use a DVD-R it will allow me to copy data and burn the disk, but won't verify the contents. Obviously I need to know that the contents are on there because it is a backup.
Am I doing something wrong?

Just an update. Couldn't find Disk Utility on CD, so rang Applecare. Apparently I don't need to install Disk Utility. They ran through a few different types of disks with me, On testing it seems to burn CDs and DVD+Rs no problem, but has an issue with verifying DVD-Rs. They suggested that I try a different type of DVD-R first, and also that I run a lens cleaner on my disk drive which seems to be taking a long time to burn. Then if I still have problems burning DVD-Rs it may be down to a problem with the Superdrive and will need a service.

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