Im using dell inspiron 3521 windows 8 preloaded.  Last week my hard drive crashed. And i dont have any recovery backup disk or usb. And now im going to buy a new internal hard drive. But dont know what to do after buying the hard drive. I know how to fit the hard drive. But dont know the step to do after that. And one more thing. Is it important to buy the same hard drive or i can buy a different one. Pls suggest me some good brands.. And steps to do after fitting the hard drive.