Get the right external storage from Android devices
<p>I tried to figure out the the right external storage (additional sdcard with more space ) location of an Android device.
I know from different user, that the location is not always the same. 
The method <code>Environment.getExternalStorageDirectory</code> returns me always <code>mnt/sdcard</code>.</p>

<p>I have the following variants are reported from users:</p>

<ol>
<li>mnt/sdcard/tflash</li>
<li>mnt/sdcard/external_sd</li>
<li>mnt/sdcard</li>
</ol>

<p>How can I determine the real location of an external sd-card?</p>
