Why are all partitions owned by the root user?

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http://www.linuxquestions.org – I am on Debian 7, I have two 500GB partitions. One partition is for the system itself and the other is for Backing up data. The problem I have is that after I type the root password to mount the partition it seems that the root user is the owner of the partition and I need to constantly use the terminal to store files. The way I would fix this on CentOS is that I would format the parition and select something like "Own this partition". However GParted requries root access and then formats it as thchown -R user /path/to/dire root user. If there is a way to open up GParted and format (HowTos)