How do I make a certain sized partition in Lion? (When I put 40.00 GB, it keeps splitting my hard drive in half)

I wanted to make a partition like this: but when I click apply, the size keeps going back to half of my hard drive. How do I get it to stay at 40.00 GB? It also shows this when I click apply, so it doesn't work anyway. How do I fix that?

You need to Drag the one partition Up from the bottom right hand corner (kind of a set of 45° line) until you get to the 40GB mark. Just typing in 40GB won't do it.
EDIT:
As to is failing first Verify the drive and Repair it, if needed. Once you drag up to make the main partition smaller by 40GB Click Apply. Then once that is done click the Plus sign to make that 40GB Un-Alocated space into another drive/partition. It is a 2 Step process. Step one making the main partition smaller. Step two creating the second partition/drive.

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