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DeltaMac

macrumors G5
Jul 30, 2003
13,757
4,583
Delaware
I don't have a 10.10 installer, but the Yosemite 10.10.2 installer requires 7.84 GB for the default, clean install.

I suspect that does not account for the other two partitions that would always be created with a Yosemite install, which would need another 860MB, more or less.
 
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