So here's how it happens, when I tried to install windows , I accidently format the whole hard disk which mean I accidently delete Mac OSX ! I had run internet recovery , and now can anyone help me to recover my lost file. In disk utility, my hard disk have now 3 partitions , 2 of them are named disk0s1 and disk0s1 and the 3rd one are windows partition. Can anyone tell me what disk0s1 and disk0s3 are ? How do I recover my lost file ? If it's impossible to recover can anyone tell me how do I delete that two weird partitions so I can make another partition to install Mac OSX ? Any help will be appreciated ! Thanks !