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I got a new Macbook Pro Retina with a 256GB SSD. The first thing I did was to try to create 2 more partitions, each one 60GB, so that one is for Windows 7, and one is for any OS X Mountain Lion Preview.

The first time using Disk Utility to add a partition was easy, and then I rebooted. And the second time I tried adding another 60GB partition from the main partition, it didn't display GB like the first time, but instead, displayed MB.

So that was weird, but I entered 60000 anyway to create a 60GB partition. But it actually ended up creating a 4.2GB partition instead.

I didn't check carefully what it was or what it contained, but rebooted and deleted that partition and try again to create a 60GB partition and it succeeded.

But what was the 4.2GB partition? Could it be the recovery partition?

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It's not quite clear what your partition table looks like from your description. Can you show the output from the terminal command diskutil list disk0 or even better, sudo gpt -r show disk0 (requires your password)? – pmjordan Jul 2 '12 at 17:42

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