Disk-Repair Programs
A good diagnostic and repair program is as indispensable as your system software in making sure your Mac continues to offer reliable performance.
Disk First Aid (or Disk Utility).
The great thing about Apple's Disk First Aid is that it's free and ships with the Mac OS (for Mac OS X, it's part of Disk Utility, an application that also includes the functions of Drive Setup, Apple's disk formatting application). The other great thing is that it lets you check and repair drive-directory problems on a startup disk (except for Mac OS X, unfortunately). Disk First Aid accomplishes this magic by closing all your open applications and then, in effect, suspending changes to the hard-drive directory until it does its work. Although ...
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