I removed the HDD inside my Macbook black and was shocked to find that there's only 1 " ribbon cable" inside the HDD slot, instead of 2 as shown in https://d3nevzfk7ii3be.cloudfront.net/igi/tu5ZK3giL52GWuVj.large ( click this link) 1) what's the function of this " ribbon cable"? 2) what will happen if there's only 1 instead of 2? will it affect my macbook? will it cause it to be non-functional ? thanks.