I was using KDE Partition Manager and while resizing was in process, my computer has turned off. Now, I have installed Ubuntu 12.10 with option of removing anything else and installing only Ubuntu. Even then, I have something like 250 MB allocated to unused partition that cannot be formated or merged with my primary one. Installation should do the trick but it didn't.
Maybe I can use LVM to do this but I haven't ever used it. Is there a way to completely wipe clean my hard drive that I'm not aware of? Please, help me out. I'm a DJ and artist and I need all space available. Nowadays 500 GB isn't much.