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I am new in Ubuntu. First I installed Ubuntu 12.10 on my USB stick which is of 16 GB. So, it installed with 2 partitions of 9 GB and 7 GB.

Now I want to format that USB. But when I try to format it, only ext4 one does get formatted but not the partition which is the swap memory. Now on other OS my USB shows only 8.5 GB.

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Are you booting to a different device than the one you're trying to format / partition? – pfeiffep Apr 20 '13 at 13:24

Try gparted - it very good for this

To install it, write next command in Terminal:

sudo apt-get update && sudo apt-get install gparted -y && gksu gparted

After you finished to install it, it will be opened now, choose your usb drive form it and can to format it or remove it and create a new one with your file system that you need.

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