partitioning - How do I install Ubuntu on one hard drive, and use a second hard drive for storage?

I have a pc with 2 500gb HDDs. I am currently running Windows 8.1 but am migrating to Ubuntu. I want to know how to setup the partitions during Installation, so that I would have Ubuntu installed on the first Hard Drive, with the whole system being there, while still being able to store random files in the second Hard Drive?

Thanks.