X240 ssd partitions

I have in front of me a brand new ThinkPad X240 and I'm trying to install Ubuntu 14.04 LTS to dual boot with preinstalled Windows 7.  On my previous ThinkPads there were two partitions, the operating system and the recovery partition but on the X240 there are in total four partitions as it comes out of the box.
In order to add Ubuntu on to the hard drive I need to free up one of them, since only four primary partitions can be on a hard drive. The problem is that I don't know what is on what partition. They are:
SYSTEM_DRV
Windows7_OS
Lenovo_Recovery
Unknown
What are those SYSTEM_DRV and the Unkown one? Is it safe for me do format either of them so I can dual boot the computer? Or is there another solution for me?

Lenovo win7 preloaded systems contain:
1. SYSTEM_DRV - system partition. Contains m$ environment WinPE and Lenovo Rescue&Recovery tools. Do not remove it
2. Windows - OS&apps
3. Lenovo_Recovery - contains .wim archives for the Factory Recovery Media creation using Lenovo tool (in Control Panel). After the recovery media (cd+3dvd or usb stick) is created this partition might be deleted.
4. seems it's an unused free space. Look at the content of this partition. I suppose its size is about 160...170 gb or several Mbs. Definitely it might be deleted.
Note after the partitions wiil be resized or deleted Lenovo Rescue&Recovery application should be reinstalled in order to laptop could boot into SYSTEM_DRV partition for the recovery reason in the future.
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