Disk Utility is Apple's go-to macOS app for finding and repairing common disk errors, but if it's your Mac's internal disk that's the problem, then your Mac might not even start up into macOS.

New version of Disk Utility can fix "overlapped extent allocation" errors As noted in Knowledge Base article #25770, the version of Disk Utility (10.5.1) included with Mac OS X 10.4.2 can fixed ...

Repairing startup disk while booted from Tiger DVD (or other Mac OS X volume) can resolve issues We previously reported that a number of issues caused by Security Update 2005-007 v.1.1 can be avoided ...

Bombich Software recently updated Carbon Copy Cloner to version 6, and its founder, Mike Bombich, posted a blog entry explaining some of the intricacies involved with updating cloning software for Big ...