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Whenever your Mac crashes, there is a chance that information on your
hard disk has become corrupted. Unless these problems are repaired, they
may propagate and lead to loss of some or all of the information on your
hard disk. Consequently, it is very important that you use the Disk
First Aid utility immediately after every crash.
First, locate either the "Apple Macintosh CD" that came with your
computer, or, if you have an older model Macintosh the "Disk Tools"
disk. Insert the CD, then restart your Macintosh while holding down the
"C" key until you see the smiling Macintosh face appear. If you are
booting from the "Disk Tools" floppy do not hold down any keys. Locate
and launch the "Disk First Aid" application.
In the "Disk First Aid" window locate the icon of the disk you wish to examine, usually your Macintosh hard disk which is identified as SCSI ID 0, and select it by clicking on it once. If a dialog box appears stating that the disk cannot be repaired then you either have open files on the disk you selected or you are trying to repair the startup disk. Although you must startup from a different disk than the one you wish to repair, you can still perform a verify operation to check the disk for problems.
Verify the disk's integrity by clicking on the "Verify" button.
As Disk First Aid verifies the disk it displays some informational progress messages. Only the final message, which will be displayed in bold typeface, is of interest.
Time Saving Tip: You can keep a copy of Disk First Aid on
your Macintosh hard disk so you can verify your disk without having
to boot from the CD or floppy. However, if problems are found, you will
still need to startup from the CD or floppy before Disk First Aid will
allow you to repair the disk.