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10.6: Resolve a non-usable disk during 10.6 upgrade
Authored by: fracai on Oct 06, '09 09:01:30AM

I had a similar issue with my laptop, that also has Ubuntu and XP installed. It turns out that in order to be considered bootable OS X (starting with Snow Leopard?) needs to have at least 100MB of unallocated space following the target partition.

I originally sized my partitions using gparted without leaving this space, at the time Leopard was already installed; hooray for live resizing.

DiskUtility was unable to downsize my HFS+ partition, but gparted was happy to do so. I subtracted 110 MB or so and Snow Leopard now happily offers my HFS+ partition for installation.

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