title: What does it mean to mount sda3 on /dev?
body: <p>I am asking this question after searching a lot on Internet.</p>
  
  <p>I am using linux on my PC. It has a disk which has 3 partitions. sda1, sda2, sda3. sda3 contains linux, sda2 is swap and sda1 is FAT.</p>
  
  <p>My question is that "sda3" is a partition which contains whole when linux than I don't understand what do you mean by mounting it on /dev/sda3?</p>
  
  <p>/home, /usr, /var everything is inside sda3 then why are we saying that we are mounting sda3 on /dev while /dev and all the other filesystems are in sda3?</p>