To upgrade your harddrive and memory in your G50 and G51 Series notebooks, you need to be able to access the guts of the notebook. To do this you need to remove 12 screws highlighted in red to remove the bottom panel.
Under the hood! As you can see there are 2 hard drives and 2 dimms for memory. Some models may only come with a single harddrive and can have a 2nd harddrive added.
Unscrew the harddrive tray from the chassis (look for 4 screws)
Pull on the ribbon and slide out the harddrive
You will notice there are 4 screws holding the harddrive. Unscrew these.
We have upgraded our harddrive with an OCZ Vertex Series SSD.
Pop it back in and and screw back everything from steps 1 and 2.
Remember you can make either harddrive the Primary Drive. If your computer does not recognize the drive as your primary, you can either switch it in the bios or physically swap the harddrives.
If your computer came with a single harddrive and you plan to add a secondary slave drive be sure to get a hard drive tray otherwise your harddrive will fall out.