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Question: Disk Utility cannot unmount disk

I am trying to reinstall snow lepord on a macbook pro. When I go to repartition the drive it fails and tells me that it cannot unmount the disk. Any ideas?

MacBook Pro, Mac OS X (10.6.7)

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Sep 23, 2011 12:54 PM in response to hoosier In response to hoosier

Then boot from the Snow Leopard installer DVD. After the installer loads select your language and click on the Continue button. Do not install. Wait for the menubar to appear then select Disk Utility from the Utilities menu.


Try repartitioning again.

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Sep 23, 2011 12:54 PM in response to hoosier In response to hoosier

Then boot from the Snow Leopard installer DVD. After the installer loads select your language and click on the Continue button. Do not install. Wait for the menubar to appear then select Disk Utility from the Utilities menu.


Try repartitioning again.

Sep 23, 2011 12:54 PM

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Sep 23, 2011 1:03 PM in response to hoosier In response to hoosier

Sorry. You did not mention that. Is this drive already partitioned into more than one volume? If so, do you have any "links" between volumes? Have you tried first shutting down the computer, then restarting to the installer DVD? Is the drive partitioned using GUID?

Sep 23, 2011 1:03 PM

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Sep 23, 2011 1:36 PM in response to hoosier In response to hoosier

Not without losing everything. Well, then, let's try something different.


Boot into Single-user Mode:


After startup is completed you will be in command line mode and should see a prompt with a cursor positioned after it. At the prompt enter the following then press RETURN:


/sbin/fsck -fy


If you receive a message that says "***** FILE SYSTEM WAS MODIFIED *****" then re-run the command until you receive a message that says "** The volume (name_of_volume) appears to be OK." If you re-run the command more than seven times and do not get the OK message, then the drive cannot be repaired this way. If you were successful then enter:


reboot


and press RETURN to restart the computer.

Sep 23, 2011 1:36 PM

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Question: Disk Utility cannot unmount disk