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The OS installer has options to accept defaults or use custom partitioning. The automatic setup will simply divide the available space, assuming you want to use the whole disk for the OS. If you created a custom extra partition you will need to create a filesystem on it, then mount it and create an entry in /etc/fstab to mount it automatically. The OS has no idea what you want to do with the extra partition. What I would rather recommend is to use the standard for the OS, e.g. 12 GB dynamic HD and create one or more additional disks in the virtual machine setup. Then partition and format these extra disks to store your Oracle installation. There is no technical reason to create additional partitions and limit the setup to one hard disk.