This issue has affected burning activities outside the Finder: Toast users appear to have the same problem.
UserEric Hoggwrites:
“I’m having the same issue.
Upgraded to OS 10.5.2 with my 20” Intel Core Duo iMac and I cannot burn discs.
Toast users will generally get an error stating: “Mismatch at byte 0/sector 0.
Fixes
Delete the Finder preferences fileThis disk verification error has been attributed to a corrupt Finder preferences file.
Removing this file should reset the problem and resume normal disk verification.