While attempting to upgrade my MacBook Pro to 10.6, I received the error message "this disk cannot be used to start up your computer." I only have one disk and one volume, so that disk was my only choice.
I tried running Disk Utility to repair the drive, but that didn't help. I searched the web and came up with a solution that works. Using Disk Utility from the installer, slightly reduce the partition size on the boot disk. The act of changing and rewriting the partition seems to fix whatever is causing the issue.
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