reble

I just got a Sony VAIO PCG 7142L laptop in a trade. The OS is Win 10 Pro 32bit. The laptop works 100% great. 4 gig's of memory and if I remember right a 250gb sata HDD. I would like at some time down the road to put in a bigger HDD. But I can't find where the access point is to get at the HDD. I found the access point for the memory on the bottom. Is this Sony laptop the same as the Asus laptop that I had? On the Asus laptop I had to take the whole top cover off to get at the memory and the HDD. I haven't found anything online so far that tells me how to get at the HDD. I could use some help please. Update. I finely found the right model number. It is on the lower right corner of the display frame. The model number is Vaio VGN-NS110E. I have no clue as to why there is 2 different model numbers. Steve