[ubuntu] VirtualBox Windows7 won't start

Hi,
I am running linux and windows 7 as dualboot.
Since I very rarely use windows I tried to access it by starting it with VirtualBox.
These are the steps I took:

• Installed VirtualBox
• Entered this code to create a file pointing to my harddrive where sda6 is the partition windows is on:
  Code:

  ---

  sudo VBoxManage internalcommands createrawvmdk -filename "windows.vmdk" -rawdisk /dev/sda6

  ---

• Created new virtual machine with windows.vmdk as source
• Started the machine

Sadly it won't start and I have no idea why.
I run VirtualBox as sudo since I do not have permission to use the vmdk-file as user (VERR_ACCESS_DENIED)

Last log is this:From there it won't go further.

I am running linux from the same SSD. Might that be part of the problem?