Mac OS X 10.5: Only installation option may be Erase and Install

When installing Mac OS X 10.5 Leopard, the only available installation option may be Erase and Install. An alert may appear during installation, such as "You can not install mac os x on this volume with out changing your installation settings...".

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TechTool Pro "eDrive"

One reason this may happen is TechTool Pro was previously used to create an eDrive on the destination volume. To resolve this particular issue, refer to this article on Micromat's website.

Check the destination volume for issues

The Leopard Installer checks the available destination disks in the background before listing them in the destination window. If the disk check does not succeed, no message is displayed indicating that an issue has occurred.

Use Disk Utility from the Leopard installation DVD to verify and repair the destination drive (choose it from the Utilities menu while started from the Leopard DVD).

Note: If Disk Utility specifically reports "Incorrect number of Extended Attributes (it should be 0 instead of [some numbers])", do this:

  1. Quit Disk Utility.
  2. Choose Startup Disk from the Utilities menu.
  3. Select your Mac OS X volume (hard drive), and click Restart.
  4. Log in as an admin user.
  5. Open Terminal located in (/Applications/Utilities).
  6. Type the following command, followed by Return:

    sudo /usr/sbin/fsaclctl -p / -e
  7. Enter your password when prompted.
  8. Restart from the Leopard Install DVD.
  9. From the Utilities menu, open Disk Utility and repair the volume.
  10. Validate that the volume was repaired.
  11. Quit Disk Utility.
  12. Proceed with your Leopard installation.

If Disk Utility reports any other issues that cannot be corrected, backup essential data, then perform an Erase and Install.

Check partition type of the destination drive

Use Disk Utility to check the Partition Scheme on the destination drive to verify that it is the native scheme (Apple Partition Map for PPC and GUID for Intel). If it is not the correct scheme, backup the data on the drive, set the correct partition scheme using the Options button on the Partition tab in Disk Utility and then click Partition.

Important: Information about products not manufactured by Apple is provided for information purposes only and does not constitute Apple’s recommendation or endorsement. Please contact the vendor for additional information.
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