Mac OS X comes with a number of utilities that can provide insight into the operation of the computer. Three major tools that are only for Mac OS X are Disk Utility, Console, and Terminal.
Detailed training on Mac OS X is available from Apple Worldwide Customer Training. For more information, see http://train.apple.com.
Disk Utility for Mac OS X combines some of the features of Disk First Aid and Drive Setup, which are separate utilities that require Mac OS 9. Using Disk Utility, you can:
Obtain information about a hard disk, including its format, capacity, and number of files
Verify and repair any Mac OS Standard (HFS), Mac OS Extended (HFS Plus), or UFS formatted disk
Erase the contents of a hard disk, ...