I have new system where installed Ubuntu 14.10, HardDisk - 1 TB, Ram - 4 GB.

Nothing is installed in the OS right now. So, I want to partition the hardisk. I want to make 2 or 3 partitions instead of the 1 right now.

I tried using GParted but not unmount current partition and create any new.

I attached screen shot of it.

Let me know if any one has a better idea or has a solution.

Thanks in advance.

enter image description here

2 Answers 2


Generally speaking, you cannot resize or change at all any partition on a storage device that is currently mounted. That means that your system needs to be down if you intend to modify the root partition, since you cannot unmount it. (I found, however, exceptions like ext4 to what I wrote here. See this question here)

You will need to boot in an external OS (e.g. using a live-CD or a USB stick) to perform these tasks. Be sure you do not have any sensible data in the partitions before you start!

Since you are using Ubuntu, I would firmly recommend you to use the Startup Disk Creator from Ubuntu and create your own Ubuntu Live CD. Then, use Gparted from the live-CD.

I assume that you will find the usage of both mentioned tools quite straight-forward, they are graphical and their GUI is quite simple.

  • You can enlarge a mounted ext4 filesystem, but not shrink it. That's the problem here. Jul 8, 2015 at 22:34

Try to boot any Linux from USB or CD and then with GParted change disk size.

This worked for me fine.


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