Hi there, Any days ago i have replacement my HDD with a SDD on my Macbook Pro early 2011, in addition i have also reused my hdd at place of optical dirve. It's all gone very well, now the boots are very fast than before. The only problem it's that now while i'm working, surfing on the web with safari etc.. there're moments in that, without a real motive, the macbook go in stuck for 30/40 seconds with the symbol of chargement. How ever it's possibole this? anyone know tell me anything? Thank!