title: Difference between sequential write and random write
body: <p>What is the difference between sequential write and random write in case of :-
  1)Disk based systems
  2)SSD [Flash Device ] based systems</p>
  
  <p>When the application writes something and the information/data needs to be modified on the disk then how do we know whether it is a sequential write or a random write.As till this point a write cannot be distinguished as "sequential" or "random".The write is just buffered and then applied to the disk when we will flush the buffer.</p>
  
  <p>Please correct me if I am wrong.</p>