DVD-r read error; keeps ejecting burnt backup disk

Hi all,
I'm running a Dual 1.8 G5 with OS 10.4.8. After 3 years of use, I had some serious hard drive errors and had to reinstall the OS, but not before backing up my system on DVD-rs using Disk Utility. I checked them on my old system and they read fine; however they aren't reading now that I've reinstalled the OS; as I insert the disk, the drive hums as if it's reading the disk and then ejects it.
Any suggestions? I'm at my wits end.
Thanks
Dave
G5   Mac OS X (10.4.8)  

Thanks.  Unfortunately nothing in that troubleshooting article addressed this issue.
The Time Machine Error I get is:  "The backup disk may have been ejected or disconnected from your computer"
Here is the latest log:
Starting standard backup
Backing up to: /Volumes/Time Machine/Backups.backupdb
132.60 GB required (including padding), 1.81 TB available
Error: (-36) SrcErr:NO Copying /Developer/Documentation/DocSets/com.apple.ADC_Reference_Library.DeveloperTools .docset/Contents/Resources/Documents/documentation/DeveloperTools/Conceptual/Xco deUserGuide/Contents/Resources/en.lproj/05_02_bs_targets/chapter_31_section_8.ht ml to /Volumes/Time Machine/Backups.backupdb/Matthew’s iMac/2011-11-02-124521.inProgress/7BB1EC56-819E-4C88-BDBD-C35A9D29A8E2/Macintos h HD/Developer/Documentation/DocSets/com.apple.ADC_Reference_Library.DeveloperToo ls.docset/Contents/Resources/Documents/documentation/DeveloperTools/Conceptual/X codeUserGuide/Contents/Resources/en.lproj/05_02_bs_targets
Stopping backup.
Error: (-8062) SrcErr:NO Copying /Developer/Documentation/DocSets/com.apple.ADC_Reference_Library.DeveloperTools .docset/Contents/Resources/Documents/documentation/DeveloperTools/Conceptual/Xco deUserGuide/Contents/Resources/en.lproj/05_02_bs_targets/chapter_31_section_8.ht ml to /Volumes/Time Machine/Backups.backupdb/Matthew’s iMac/2011-11-02-124521.inProgress/7BB1EC56-819E-4C88-BDBD-C35A9D29A8E2/Macintos h HD/Developer/Documentation/DocSets/com.apple.ADC_Reference_Library.DeveloperToo ls.docset/Contents/Resources/Documents/documentation/DeveloperTools/Conceptual/X codeUserGuide/Contents/Resources/en.lproj/05_02_bs_targets
Copied 345255 files (11.4 GB) from volume Macintosh HD.
Copy stage failed with error:11
Backup failed because the destination disk was ejected or disconnected unexpectedly!
Backup failed with error: 27

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