Re: GUID Partition vs Apple Partition
In Disk Utility select the partition Tab. Underneath the volumes you will see an Options Tab. Click on that and you will be able to select between GUID & Apple Partition Map.
From memory, if you have multiple partitions on the drive, you may not be able to select the Options tab. IU think this requires a reformat into one partition as I don't believe your physical HD can have more than one partition type for each volume.
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