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How can I format a drive using the GPT format on OS X? I don't see this option in Disk Tools.

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up vote 8 down vote accepted

Assuming you mean Disk Utility, you have to select the drive itself (as opposed to an individual partition)*, and then you will see a Partition tab. Then on that tab, select the partition layout you want, and at the bottom click 'Options...' — you'll be able to select GUID Partition Table from there.

( * Apologies if this is patronising, but just to be 100% clear, in order to change the partition scheme you'll have to erase the entire drive. You can't change it for just one partition. )

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But is one of the available formats GPT? – cwd Oct 21 '11 at 15:20
GPT stands for GUID Partition Table (unless you've hit on something i'm not familiar with, but i even googled it), so yes. In the partition options pane there are three partition schemes, and GPT is one of them. – kine Oct 21 '11 at 18:01

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