Partitioning the Lenovo Ideapad Z580 for dual-boot

view story

https://bbs.archlinux.org – I'm going to install Arch Linux on my new laptop, and want to keep the existing Windows 7 installation as well. The problem is that there can only be four logical partitions, and they are all being used by Windows/Lenovo:I was thinking of converting the C drive, which is the largest (600 GB) into an extended type, then using that partition to create logical partitions and use those for Arch. Is this possible to do? Will I be able to install linux in logical partitions, or are primary partitions needed?Another idea I had was to somehow merge the existing partitions together, but don't (HowTos)