title: How do I compute the capacity of a hard disk?
body: <p>I have a worked example of how to compute the capacity of a hard disk, could anyone explain where the <strong>BOLD</strong> figures came out of?</p>
  
  <p>RPM: 7200</p>
  
  <p>no of sectors: 400</p>
  
  <p>no of platters: 6</p>
  
  <p>no of heads: 12</p>
  
  <p>cylinders: 17000</p>
  
  <p>avg seek time: 10millisecs</p>
  
  <p>time to move between adj cylinders: 1millisec</p>
  
  <p>the first line of the answer given to me is:</p>
  
  <p>12 x 17 x 4 x <strong>512</strong> x <strong>10^5</strong></p>
  
  <p>I just want to know where the parts in bold came from.The 512 I dont know. The 10 is from the seek time but its power 5?</p>