Mac OS X 10.5 Leopard: Installing on a UFS-formatted volume

(The following is from the Mac OS X 10.5 Leopard "Read Before You Install" guide.)

This article has been archived and is no longer updated by Apple.

Installing on a UFS-formatted volume

You cannot install Mac OS X Leopard on a UFS-formatted volume. In addition, you
cannot upgrade older versions of Mac OS X installed on UFS-formatted volumes to
Leopard. To upgrade to Leopard you need to reformat your startup volume. Before you
do that, you need to back up your information.

To install Leopard if your current system is on a UFS-formatted volume:

1. Turn off FileVault for all user accounts on your computer.

2. Connect an external disk to your computer.

3. Insert the Mac OS X Install disc and double-click Install Mac OS X, and then click Restart.

4. When the Mac OS X Installer opens, choose Utilities > Disk Utility. In Disk Utility,
click Restore. Drag your startup volume to the Source field and drag the external
disk to the Destination field, and then click Restore. Quit Disk Utility when this

5. In the installer, continue to the “Select a Destination” pane and click the Options
button. Select “Erase and Install” and make sure that the format is Mac OS Extended

6. Follow the onscreen instructions to install Mac OS X Leopard.

7. After installation finishes, the Mac OS X Setup Assistant opens. In the “Do You
Already Own a Mac?” pane, select “from another Mac.”

8. Click Continue in the next pane. You don’t need to hold down the “T” key because
the external drive is connected to your computer.

9. Follow the onscreen instructions to use your external drive to restore your
information on your startup disk.

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