Does anybody know what this is?

[Ihavenousername]

Look at this picture:

http://

I think it is a secondary port to insert or attach another HDD/SSD, but I am not sure, could anyone please explain? By the way, it's the blue thing that says vendor.

EDIT: Sorry, image did not appear.

 

[Tbonius]

And here it is. http://www.ebay.co.uk/itm/HP-15-AC-OPTICAL-DRIVE-CD-DVD-DRIVE-CONNECTOR-ADAPTER-LS-C706P-455MW432L01-/111899623142

 

[Ihavenousername]

Thank you very much!