Repairing a dam aged 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 adisk is damaged or unreadable, you may
need to repair the disk.

Try t hese 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:
mIf the hard disk is internal, shut down your Macintosh, wait at least 10
seconds, and then turn it on again.
mIf the hard disk is external, make sure that it is turned on and that its cable
is connected firmly; then restart the Macintosh.
mIf 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).
mCheck 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 settingSCSI ID numbers and terminating a SCSI
chain, see the manuals that came with your SCSIequipment.
mIf none of these suggestions solves the problem, test the disk by following
the instructions that come next.
63
Troubleshooting