3 Replies Latest reply: Sep 30, 2012 6:19 AM by Tom Ostertag
Tom Ostertag Level 1 (10 points)



My G4 Gigabit 450MHz DP tower died and I was able to replace it with a G4 MDD 1.25GHz DP PowerMac. I did a hard drive replacement and the new (vintage) computer works just like the old one. The Gigabit was at Mac OS X 10.4.11 but the MDD can be updated to Mac OS X 10.5.4. I have the discs for Mac OS X 10.5.4 from my MacBook Pro and the MDD read the discs. I didn't go any further than that as I have a question regarding the current master hard drive. The Gigabit had a limit of 128 GB for the boot hard drive and I purchased a program that allowed the memory above 128 GB to be used.


Now the questions:

Does the G4 MDD have the same 128 GB limit?

Will the +128 modification cause problems?


Any other tips and suggestions for this upgrade?



PowerMac, Mac OS X (10.4.11)
  • Niel Level 10 (298,669 points)

    1. No.

    2. Probably not.

    3. You need to use a retail DVD and not those disks to upgrade.



  • Limnos Level 8 (47,386 points)

    The MDD should recognize your larger drive.  My 2002 Quicksilver does.


    The MDD may read the MBP discs but I sincerely doubt it will boot from them which is what it would have to do to install 10.5.  You will have to obtain a retail set of discs which will not be easy nor cheap.


    Texas Mac Man, Leopard disc sources - https://discussions.apple.com/thread/3636662


    "a brody" post about upgrading to Leopard - https://discussions.apple.com/thread/3373795

  • Tom Ostertag Level 1 (10 points)

    Neil and Limnos:


    Thanks for the help! The program I used for the drive issue was SpeedTools ATA Hi-Cap and I was able to find additional information on line.


    Also, I should have mentioned that the disc was a 10.5 System Update disc that came with my MacBook Pro when I purchased it in December 2007. Mac OS X 10.5 had been released but 10.4.11 was installed and running on the MBP. I received this Mac OS X v10.5 CPU Drop-in Kit, 607-1023 disc. I used it to update the MBP and then let it gather dust in my computer closet. Last night I thought, what the heck... it worked and now I have scores of updates to plow through before I can back it up.


    Thanks for the help!