Hmm, Cirular read errors would'nt be the same as Cyclic Redundancy Check would it;). This error occurs when there is problems reading the Disc. Could be drive related, but highly likely that it is the Disc that is causing you woes. As stated before, has the disc got any defects on it or things that may stop a good read (Smudges, scratches, dirt etc.)
Also, is this an original disc you are reading from?