CrazyCrow

When I try to save an image from a CD to a file I get this error: Failed to Read Sector 844 - L-EC Uncorrectable Error When I continue past the error, I get the same thing for sectors 856, 865, 898, 939, and who knows what else. Wierd thing is, there's only 837 sectors on the disk. Anyone know what's going on here? Is this a painfully obvious problem? I hope I'm not overlooking something.