title: Change android emulator sdcard permission
body: <p>I want to change my android emulator sdcard read only permission, for that I typed </p>
  
  <pre><code>mount -o remount,rw /mnt/sdcard
  </code></pre>
  
  <p>in adb shell. But it shows</p>
  
  <pre><code>Usage: mount [-r] [-w] [-o options] [-t type] device directory
  </code></pre>
  
  <p>Whats the problem in the command I have written in the adb shell. </p>