Trouble upgrading OSX, because HD doesn't use GUID Partition Table Scheme

Posted by Erik Vold on Super User See other posts from Super User or by Erik Vold
Published on 2010-06-15T23:14:01Z Indexed on 2010/06/15 23:23 UTC
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So I have a intel-based macbook with osx 10.5 and I'm trying to upgrade to 10.6, but when I run the upgrade 'install' I quickly get to a page where I am supposed to 'Select the disk where you want to install Mac OS X' and there is only the one hard drive, so it is auto selected, and below that I see a warning message and the only button available is the 'Go Back' button.

The warning message says:

"Macintosh HD" can't be used because it doesn't use the GUID Partition Table scheme.

Use Disk Utility to change the partition scheme. Select the disk, choose the Partition tab, select the Volume Scheme and then click Options.

So I followed the above instructions, and I got to the last step, where I'm supposed to click the 'Options' button, the problem is that I cannot click that button, it is disabled.. So what am I supposed to do?

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