if like this need to look ppl to help me change it

donno how to do it as i am a DIY nub   

i noticed my stock 120 giger for my slim, now laggy. I left my PS3 with my brother, he told me he cant even play Shank. Then I tried god of war 3, stutters like pirated media in the opening credit. but not all games like that, only those which depend on the HDD. so, i backed up my data using the Back Up Utility onto my external HDD, which took like 3 hours of 72 gigs of data. I reformated the PS3 hdd. and then I restore the data back, ... from midnite last nite, and when I woke up this morning, still got 7% to go.. jezzzz THAT long.. later I balik I will update whether this solved the stuttering problem or not. lucky next week I am shopping either a 50giger or 750..