Disk utility 'input/output error' message?

I am "creating an image" of a DVD using disk utility (prior to making a copy on a blank DVD disk).   Why am I now rec'ing an 'input/output error' message?   I have already copied several other DVDs from the same author (with her permission, they are not copywrited.) w/o a problem.
What's going on?  original damaged? an incorrect step on my part?  some sort of space problem?  ( I have tons of room on my iMac.)
Thanks for your help.

Take a look at Cinematize 2, I've used it with iMovie 06 and iDVD 08. It has several modes of converting the data. One mode is called "lossless".
For the job you're doing you may prefer to use iMovie 06 instead of iMovie 08 (I would).
iMovie 06 and iDVD 08 is a terrific combination.
Your workflow would go something like this.
Use Cinematize 2 to create a Quicktime file from the DVD.
http://www.miraizon.com/products/products.html
Important that file into iMovie 06.
From iMovie 06, share to iDVD 08 (assuming you want a DVD).

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