Why do i have two identical internal hard rive in my MAC? It makes my laptop very slow

My Mac book Pro is very slow since a few weeks. I decided to investigate. When i look in Disk Utility, i see two internal hard drive! The first one is almost full (18 Mo free on 800 Go). The second one is half full (this one is the one i see when i click on About this Mac, 400 Go free on 800 Go). I guess the first one is the one that make my computer so slow. Does anybody knows how this can happen ? What can i do for it ? It seems like the second one is a part of the first one.
Thanks !

OS X 10.10 Yosemite
If you see 2 Macintosh HDs   when you check  Disk Utility, that is normal on OS X 10.10.Yosemite.
It is the Core Storage and Volume Manager technology in action.
There is no Knowledge Base Article from Apple  about this yet.

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