I just a laptop which I want to buy for second hand. For checking the same I was having a look on the same. Below side of the laptop the DVD Rom is located. I had opened the bottom cover and found that there is an empty slot below. It is small rectangle shape slot. I am not able to figure out what is this for actually. The laptop is fine and I need more specification of the same. The thing that is annoying me much is that what does that empty slot has. Does some part from that is being removed or replaced. I am not sure about the same. Where can I get information on that. A specification information on that can define the same.