title: What does 128M mean?
body: <p>Reading configuration files, like my.cf, I am seeing this:</p>
  
  <blockquote>
    <p>This is for a system with little memory (32M - 64M) where MySQL plays</p>
  </blockquote>
  
  <p>What does the <code>M</code> mean in general, and what kind of measurement unit is it in? Does it refer to a megabyte which has the value of 1024?</p>
  
  <p>If a machine has 1 gigabyte of ram how much <code>M</code> is that? </p>