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ristar's picture
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Joined: 2016 May 27
Can't Boot OS9 Disk On MDD

I am trying to dual-boot OS X 10.4 and OS 9.1.2 on two separate hard drives inside my PowerMac G4 MDD. I formatted the OS 9 drive as "Mac OS Extended" and chose to install the OS 9 drivers, and then copied the contents of this image to the drive:

http://macintoshgarden.org/apps/mac-os-922-powermac-g4-mdd

However, whenever I hold down Alt to go into the boot menu on startup, the OS 9 hard drive is not there - only the OS X drive. I was able to burn an OS 9.1 installer ISO to a disk and boot into that successfully, but when I try and start the installer, it gives me a "This program cannot be installed on your computer" error. Any ideas on what to do?

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MacTouch's picture
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Joined: 2016 Mar 19

I think what is the problem for your system. So, when you are on Mac os X, have you a little icon over the folder "System" of Mac os 9 or not ? If not, just open the folder, locate the system file, remove it elsewhere from the folder, then move it again in the folder. If the little icon appear, it's good, you can boot on os 9. For your information, except for this image, PowerMacs G4 MDD family cannot boot on Mac os 9... Also, this image only works on G4 MDD with Firewire 400. I really hope my response will help you.

ristar's picture
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Joined: 2016 May 27

Unfortunately, I have no icon on the System Folder in the OS 9 drive, and when I try to do the "move in-out" trick, it gives me an error saying "this folder is needed by the system".

How do I tell the difference between the FW models? Which image do I download to make the other type work?

ristar's picture
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Joined: 2016 May 27

I also tried burning the 9.2.1 installer to a disk and got the same error mentioned tin the latter half of the original post.

blackholemac's picture
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Joined: 2010 Nov 17

An MDD G4 tower (assuming you have an FW400 model not the FW800 model...that's a different conversation.) requires a very special build of Mac OS 9.2.2 on it. It will not accept anything older. Additionally, you have to have the Mac OS 9 drivers installed on the hard drive you are trying to put it on. To do so, you either need to format the drive with Drive Setup 2.1 (not older) OR format the drive including Mac OS 9 drivers using Disk Utility on OS X.

ristar's picture
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Joined: 2016 May 27

That is what I did to set up the drive in 10.4. Still no luck getting it read as bootable.