[ubuntu] Change Partition to Extended Partition without Data Loss

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http://ubuntuforums.org – Hi, I'm trying to install Ubuntu on my laptop already running windows, but I just realized that a hard drive can only have 4 primary partitions (noob errors). I have a 500gb hard drive. The four partitions are the following: 1 Windows partition (450gb) with 300gb unused, a System partition from windows thats about 200mb, a 13gb partition labeled RECOVERY, and a 100mb partition labeled HP_TOOLS. I have no clue what the last two are, so I dont really want to delete them. I originally wanted to split the unused space from my main drive into a ubuntu system partition, and a partition for all my fi (Hardware)