Difference between iPod capacity and availability?

brittany

New member
I was looking through the settings on my iPod Touch and I have the 8GB, but it says under about in settings: capacity: 6.5 and availability: 6.1. Sorry I can't press enter, but do I not have a full 8 GB available, and just used that much or have I really just used so much and it just saves extra too?
 
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