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Repairing a damaged disk
Disks can become damaged by repeated use and handling.
When do you need to repair a disk?
If you see a message reporting that a disk is damaged or unreadable, you may
need to repair the disk.
Tr y t h ese suggestions first
If you can’t start up from a hard disk or you don’t see the hard disk icon on the
desktop, try the following:
m If the hard disk is internal, shut down your Macintosh, wait at least 10
seconds, and then turn it on again.
m If the hard disk is external, make sure that it is turned on and that its cable
is connected firmly; then restart the Macintosh.
m If the hard disk is your startup disk, start up with a different startup disk. If
the hard disk’s icon appears on your desktop, reinstall system software on
the hard disk (see “Installing or Reinstalling System Software” later in this
chapter).
m Check the ID numbers of all SCSI equipment connected to your computer.
Each device must have a unique ID number less than 7. (The computer
itself has the ID number 7, and the internal CD-ROM drive has the ID
number 3. The ID numbers 0, 1, 2, 4, 5, and 6 are available for additional
SCSI devices.) Also check that the chain of devices is terminated properly.
For information on setting SCSI ID numbers and terminating a SCSI
chain, see the manuals that came with your SCSI equipment.
m If none of these suggestions solves the problem, test the disk by following
the instructions that come next.
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Troubleshooting