Can't Create Partitions

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http://forums.fedoraforum.org – I have a laptop with 3 primary partitions and 1 extended partition. I want to install linux in extended partition. But when I custom create partitions, it says : "Couldn't allocate requested partitions, not enough free space on the disk" I can't even create Physical Volume. I can't remove the primary partitions, as those are for recovery and windows os. Here's the screenshot. (HowTos)