You use the
fsck command to repair corrupted or damaged hard disks in Mac OS X Server format.
You use Disk First Aid to verify and repair a hard disk in Mac OS Extended format. The volumes you use to store NetBoot users' documents use Mac OS Extended format.
Note: Some volumes can be verified but not repaired, such as the volume the Disk First Aid application is stored on, a write-protected disk, or a disk that has open files. On your NetBoot server, the Disk First Aid application is located on a volume formatted in Mac OS X Server, and Disk First Aid does not verify or repair this type of volume.
To verify or repair a hard disk:
1. Log in to the server as the Administrator ("root").
2. Open the Server Administration menu (in the Apple menu) and choose Disk First Aid.
3. Click the volume you want to verify or repair, then click Verify or Repair. You verify a hard disk first. If problems are found, then you can repair the disk. You can select more than one volume by pressing the Shift key while clicking a volume.