There are two msata slots. If you're laptop does not currently have a SSD they are most likely both unoccupied. Personally I think the Plextor you linked is a bit expensive. I have always had good results with samsung and crucial SSD's. Both the Samsung 840 evo and crucial M500 msata variants can be had for comparably cheaper when you consider the price per/GB. Crucial makes the M550 in msata which boasts better specs at a slightly higher price too. Also as I've mentioned, I've always had good results with both manufacturers with neither companies drive ever failing me.