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Hi guys,
I am writing this because i tried everything and then i found this forum.There was said that it's free to ask and i will do it.
My laptop (Lenovo G510) was working fine i had issues in past with integrated graphic card but they fixed it and they also replaced my HDD.It's 1 year from that moment when they did it it was working just fine all the time until last days.My laptop started to be laggy and I started to look up whats wrong with it.In task manager i saw that i have sometimes 100% disk usage and that causes these lags.I have read a lot of forums and watched milion videos how to fix 100% disk usage. I have disabled SUPERFETCH and WINDOWS SEARCH and all of this stuff i was hoping that this will help.My disk usage is not still on 100% it's like all 3 minutes or it deppends on what am i doing.But i can't exist like this and i found on forum that check for malware is number one solution so i run "Smart scan" (NOD32 ESET antivirus) it was just fine 0 viruses found.Maybe it can't find malware i have run SEA TOOLS for windows too and my LONG GENERIC test failed another ones was sucessful.I really want to fix this but i don't have that knowledge to do it alone so here I am asking for your help what should i do ?I also noticed that sometimes there is notification (SATA unknow disk removed) or something like that and i have never seen something like that before.
Hope we can solve this 
