[ubuntu] Dual boot problem with 4 partitions on HP Pavilion dm4

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http://ubuntuforums.org – Have an HP Pavilion dm4 i3 laptop with Windows 7. I want to dual boot it with Ubuntu 12.04. Problem is that HP laptop HDD already has 4 partitions: 1. System partition.....199MB 2. C-Drive with W7.....582GB 3. Recovery partition...13.85GB 4. HP Tools partition...104MB When I try to create an Ubuntu partition, it becomes Unallocated and dead/useless. Therefore I can't install Ubuntu as a dual boot system. Did a little checking and it seems you can't create more than 4 partitions on a HDD. I know there are ways around this but I can't remember what needs be done. Can someone he (Hardware)