<p>I'm trying to refer to a drive whose letter may change. I'd like to refer to it by its label (e.g., MyLabel (v:) within a Batch File.  It can be referred to by V:\ . I'd like to refer to it by MyLabel.</p>

<p>(This was posted on Experts Echange for a month with no answer. Let's see how fast SO answers it )</p>

You can use the WMI query language for that.
Take a look at
http://msdn.microsoft.com/en-us/library/aa394592(VS.85).aspx
for examples.
The information you are looking for is available e.g. through the property VolumeName of the Win32_LogicalDisk class,
http://msdn.microsoft.com/en-us/library/aa394173(VS.85).aspx
```
SELECT * FROM Win32_LogicalDisk WHERE VolumeName="MyLabel"
```