Input/Output Error on Disk Utility

[dxp4acu]

I keep wanting to make a copy of a DVD I made on iDVD, but the Disk Utility keeps giving me an Input/Output error when it is saving the DVD to the computer. I don't have all the files on my computer anymore to make the DVD again, as it took up too much space. I tried this on my computer (PB 12", 867mhz,10.3.6), and my friend's new iMac (10.3.5). Same problem. What gives?

 

[Mechcozmo]

Use Mac The Ripper to extract the DVD contents and then you should, theoretically be able to reburn it.