Problems formating a thumb drive to ext4.

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http://www.linuxquestions.org – Greetings from Amsterdam How do I format a 16GB USB stick to ext4 or 3, so that it is read and write and I am recognised as the owner? I 've tried formating it via the terminal. In this case my stick is /dev/sdd1. To unmount I run: umount /dev/sdd1. I then run: mkfs.ext4 /dev/sdd1. The stick is formatted but it is read only and I'm not recognised as the owner. It is the same when I use GParted. I want to use it for Porteus 2. I just can't do anything with it because I don't have permissions and I can't change the permissions. What am I missing? Help please. (HowTos)