Does your mind works like a hard disk?

Have you ever dream of something,and then you woke up and think,"Hey,didn't I try to forget that part of my life?".Like a hardisk in a computer,if you deleted something,it does not means the information will be deleted forever,it just tells the computer that the available space is ready to be rewritten?Just like you brain,sometimes you try to forget something,then it somehow pop up again like in a dream.