title: Amazon Elastic Block Store and EC2 drive
body: <p>I am fairly new with AWS(just have a free AWS EC2 instance to test out AWS stuff) so the question might sound silly.</p>
  
  <p>Today I got a mail that my Amazon Elastic Block Storeage has reached 85% usage on my free AWS account which is about 25 GB of the allocated 30 GB.
  From what I read today, Amazon EBS is a persistent store used for EC2 instances.</p>
  
  <p>However I can see in my EC2 instance that df -h just show 2 GB usage and available disk as 28 GB as this is just my practice instance.</p>
  
  <p>Am I missing some important piece of information here?</p>