Unable to unmount Macintosh HD during disk erase and SL install

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Level 1

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Unable to unmount Macintosh HD during disk erase and SL install

Long story short...

I was having problems and used Disk Utility to try to repair the disk. I got node errors and was told that I should reformat my drive.

I have booted from the SL install DVD and am trying to erase the disk and reinstall SL. During the erase process my mac hangs on "unmounting disk" (the original partition that SL was installed on.

Am I out of luck? Please help... if you can.

MacBook5,1, Mac OS X (10.6.4), Intel Core 2 Duo / 2.4 GHz (iPhone 3GS)

Posted on Jul 9, 2010 3:23 PM

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Answer 1

R C-R

Level 6

17,782 points

Jul 9, 2010 4:10 PM in response to emcurry

If you have actually booted from the SL install DVD, your HD partition should mount & unmount as necessary with no problems unless there is some hardware problem with the HD or a related hardware item.

First, make sure you are booted from the DVD -- no Finder or user login, Disk Utility available from a "Utilities" item in the main menu bar, etc. Then in Disk Utility make sure you are selecting the correct partition for the erase (or the whole HD if you are reformatting it from the "Partitions" tab).

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