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 overlapped extent allocation errors -- problems with disk directory structure ...

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.

It won't cure all of your Mac's ills, but a quick and easy first step toward bringing a sluggish Mac back to health is using OS X's Disk Utility to repair disk permissions. Matt Elliott Senior Editor ...

OS X’s Disk Utility—which enables you to format, partition, repair, and perform other kinds of maintenance on disks (including SSDs, flash drives, and disk images)—is good for what it does. Yet for ...

Mac OS X version 10.5 Leopard provides the most recent version of the Macintosh operating system that runs on many PowerPC-based Apple computers. Like previous and later versions of the Mac OS, ...

The First Aid feature in Apple’s Disk Utility (/Applications/Utilities) represents one of the oldest and most helpful repair utilities available for your Mac. But ...

OS X offers a very nice graphical user interface to verify and repair your hard drive, located in the Utilities folder. It’s called Disk Utility, and you can use it as the first line of defense when ...

Repair Disk isn’t the first option you should choose if your Mac is ailing, but it is helpful when (for example): Performance has degraded Data is missing You are experiencing degraded system ...

Then look for the "Run Disk Utility" command in the Apple menu or the Installer menu (anyway, it's up in the menu bar) and run the repair routine. ••• Report D ...