I want to install Ubuntu 12.04 LTS x64 alongside with Windows 7. I already have 3 primary partitions taking the whole disk space.

1. 100 MB system-reserved (primary)


2. 180 GB system (primary)


3. 285 GB data (primary)

I want to resize the partitions so they look like this afterwards:

1. 100 MB system-reserved (primary)


2. 100 GB system (primary)


3. 300 GB data (primary)


4. 100 GB ubuntu (extended; contains boot, root, home and swap logical partitions)

Is this possible (and safe) to prepare my hard drive like that during the installation process? I know that you can resize partitions. But the built-in Windows 7 disk management tool for example cannot shrink my system partition (C:) to 100 GB, because it is not capable of moving files, which is necessary.

Thanks for your time.