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Topic: Reliable determination (program way) presence SD- and a way to its root. How?

For Androida of versions above 4.3 I do here so (C# Xamarin):

Java. IO.File [] externalFilesDirs = Android.App.Application.Context.GetExternalFilesDirs (null);
if (externalFilesDirs. Any ())
{
mount = externalFilesDirs. Length> 1 && externalFilesDirs [1]! = null? externalFilesDirs [1].AbsolutePath: string. Empty;
}

There are other variants?
Thanks!