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

Posted on 2007-08-01
Medium Priority
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
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LVL 41

Expert Comment

by:Eoin OSullivan
ID: 19608081
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

ID: 19608233
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 41

Accepted Solution

Eoin OSullivan earned 1500 total points
ID: 19608262
YES... Call Apple Support

Author Comment

ID: 19848899
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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