Consolidating two hard drives without duplicating songs?

I have two hard drives full of music. Each drive has about 300GB of music each. 90 percent of the music on each drive is the same(copied from one drive to the other over time). However, about 10 percent of the music is different on both drives. If I consolidate the music of both drives is it going to create a 600GB music library or does it recognize similar songs and not copy duplicate songs?
Thank you for your help
Brian

Open Disk Utility, which is located in Applications/Utilities/ folder.
Look at the sidebar. You should see the connected storage devices. The devices (or drives) are listed flush against the left edge of the sidebar. Indented to the right, below each device, you should see the volumes on that device. Normally, there should be one volume under a device.
Describe what you see? Where is the "(2)"? Is it under a device by itself, or is it with another volume under a device.

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