In this guide, I’ll remove the Asus N551JK’s back cover, refer to this guide, you can upgrade RAM, SSD and hard drive for your Asus N551JK.
This is my new Intel 120GB SSD.
Remove two screws securing the service cover.
Sliding and remove the cover.
Under the cover, you can get access to the hard drive, wireless card and ram slots.
The Asus N551JK comes with a HGST 1TB 5400RPM hard drive.
This is the 2ND HDD caddy.
Remove one screw and pull out the optical drive, remove the bezel from the optical drive and install it to the 2ND HDD caddy.
Asus N551JK comes with a 4GB PC3L-12800s ram, you can add another 4GB RAM.