Whats this PORT beneath HDD cover of Samsung Laptop RV518

Hello Friends,

I was planning to upgrade one laptop with a new SSD , though I was looking for mSata but there is provision of that in this laptop hence I decided to go for an SSD instead of hard disk drive. So today when I opened back panel of my laptop to replace hdd, I saw a port which I don't recognize. Now there is no easy way to search information about this free port, it looks to sata port / connector but only smaller in size. Please see the picture below and let me know if you what it is ?

Attachment 2289

You may click on picture to zoom it. I have market a red square around it. Let me what it is .

No idea , I have next to Nil knowledge about laptop. I think you should ask some guys who are into laptop repairing or something.