Mac OS X, Mac OS 9: Use Current Startup Disk Control Panel or Mac OS 9.2.2

You should update your Mac OS 9.1 Startup Disk control panel to version 9.2.1 or later. Updating to Mac OS 9.2.2 is recommended for best Mac OS X compatibility (applicable when both are installed on the same computer).
This article has been archived and is no longer updated by Apple.
Note: If you are using Mac OS 9.2.1 and Mac OS X 10.1 , you already have the appropriate Startup Disk Control Panel installed and do not need to use the information in this document.

When both Mac OS 9 and Mac OS X are installed on the same computer, use Mac OS 9.2.2 for best results. You may update to Mac OS 9.2.2 from earlier Mac OS 9 versions by using Apple Software Downloads (

If Mac OS 9.0 to 9.0.4 is installed and you are unable to select the Mac OS X System folder in your Mac OS 9 Startup Disk control panel, you should install Mac OS 9.2.2. The Mac OS X 10.2 Classic environment cannot use a Mac OS 9.0 to 9.0.4 System Folder.

For a temporary workaround, you may install Startup Disk control panel 9.2.1, available from software download document120024, "Startup Disk 9.2.1 Document and Software".

    1. On some computer models, you can force-start up from Mac OS X by pressing the X key during startup.

    2. If you have Mac OS X 10.0, you should restart your computer from Mac OS 9.1 or later before installing any Mac OS 9 software updates that you have downloaded.

    3. For potentially related information, see technical document 107285, "Macintosh: Computer Can Start Up From Mac OS X But Not From Mac OS 9".
Published Date: Oct 7, 2016