Where disk quota is taken from when creating a new partition + on which partition linux is installed

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http://stackoverflow.com – I'm trying to figure out how the paritioning works, so I'll know which partition I can format or create for data, and which I should format to reinstall linux. Using "df -hT" I got this: Filesystem Type Size Used Avail Use% Mounted on /dev/sda2 ext3 15G 4.4G 9.1G 33% / /dev/sda1 ext3 996M 40M 905M 5% /boot tmpfs tmpfs 2.0G 0 2.0G 0% /dev/shm I want to create a new partition. Where is the disk memory taken from? An existing partition? Or from memory that isn't partitioned and don't appear in this list? Another question related - is the defa (HowTos)