Why suddenly unable to create a disk image from a CD?

I successfully created a disk image from a CD only 5 days ago. Now when I try to create a disk image from a CD (with Disk Utility) the Superdrive rumbles along for sveral minutes, while the progress bar indicates that it has reached the end of its progress.
Only after all that does a dialog box indicate:
"Unable to create "___.dmg"-Invalid Argument. "
I haven't added software but did upgrade to iTunes 6. Doubtful that could affect my abilty to create a disk image.
Would someone kindly shed some light on why this may be happening?
Steve

Is it strange that this problem seems CD-specific?
Some CDs are copy-protected and some CDs are not copy-protected; so, no, it's not strange at all that you should be able to copy some CDs and not be able to copy others.
Tuttle
1682/8380

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