MacBook Pro electricity noise

Hi,everyone

I replaced my MacBook Pro with a new one yesterday because of this issue, now it's happen again!!!It drives me to nut.Ok,let's talk about what the issue is.Whenever I transfer , copy my or download files ,I can hear the high pitch noises,the buzz,also sound like electricity noise coming from the bother board.it is faint but audible,you have to be in very quiet place and listen carefully or be close to the computer if it's necessary.You guys can have a try,it's easy,just download a boot camp windows support.As i have mentioned before,I last MacBook has the same issue.So I am wondering now if it's a prevalent defect or just I was so **** unlucky.