Removing Volume with Disk Utility Help

Hi everyone. I've recently used bootcamp to dual boot ubuntu, it kept freezing on each login so i went into disk utility, and am currently removing the disk volume for ubuntu - 32GB.

The problem is it's still preparing the removal and it's been 15 hours. When i try to quit the program it says that the operation is still going, so i don't quit as the partition will be damaged. So how long will it take to remove a 32GB volume - should it take this long? I'm using a Macbook Pro 2.5GHz, 4GB RAM.

Thanks.

 

To install it i partitioned my hard drive using boot camp, and manually created a partition for ubuntu and a linux swap partition during installation of ubuntu - no hacking. Installation went successfully without an problems.

How could i reformat my hard drive to 1 partition of OS X? This wouldn't be a problem as i've backed up all my data.

Thanks.