Keep in mind the following key points about Repair Disk: All hard disks have one or more volumes or partitions. A volume, also known as a partition, is section of a physical hard disk which, from the perspective of the operating system, works like a separate disk. The directory is analogous to a combined address book and road map to where data is stored on a disk or volume. Repair Disk verifies and, if problems are found, corrects issues with the directory on a disk or volume. It is a subset of the more comprehensive information on these topics from our book, Troubleshooting Mac OS X.
This FAQ provides a brief overview of the Repair Disk and Repair Disk Permissions functions of Disk Utility in Mac® OS X.
The Repair functions of Disk Utility: what's it all about?
