Cannot install Mac OS X disk failed with error could not unmount disk

Posted on 2007-08-01
Last Modified: 2013-11-24
Hi Macintosh gurus,
I am in a bit of problem at the moment, I have a Intel MacBook it had 10.4.10 installed on it I could not load Mac: Office on to the machine so I was advised to reinstall Mac OS X 10.4.11 on the machine and then try. I must admit in my hast I powered down the machine a couple of times using the power button and started the MacBook from the DVD, I got with the laptop. All went well till now, but after the install reaches half way it says cannot install please try again.

I am thinking well let me format the disk from the Disk utility, which I did and restarted the machine then it did the same thing and stopped halfway with the error. When I tried to verify and repair the disk using Disk Utility I keep get the error disk failed with error could not unmount disk what ever the hell that means, this error does not appear when I restart and then verify or repair disk.

I need to install OS X on this laptop what should I do? Please help
I have tried to Zero the hard drive and install the OS Again.
Question by:Ans_wehave
    LVL 39

    Expert Comment

    Sounds like you've done almost everything I could have suggested.

    If you boot from the OSX install DVD (holding down C on reboot), run Disk Utility from the File Menu on the first screen of the install sequence.
    Then reformat the drive as HFS extended and proceed with the install
    If you get a HD error after all that then the bad/good news is that you've done everything right and it is a faulty Hard Drive and covered under warranty (as long as you've a new macbook). Contact Apple Support and get it returned.

    Author Comment

    I ran a hardware test and it reterned this error "4mem/1/40000000 2d5971dc"
    Do i need to call apple and log a call for support?
    LVL 39

    Accepted Solution

    YES... Call Apple Support

    Author Comment

    The Hard Drive was faulty, insert the OS DVD  which came with the MacBook and restart the computer wit hthe 'D' button held down. runn a hardware test and that showed there was some thing wrong with the Harddrive. Apple repare center replaced it for free.

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